I'm creating a custom System Target File (STF) and adding some RTW options that need to be configured. Some options are dependent on others, and may or may not make sense depending on how they are configured. In these cases I would like to conditionally disable them (grey out).
So far I have something like this (Using MATLAB R2014a)
...
rtwoptions(oIdx).prompt = 'Enable Foo';
rtwoptions(oIdx).type = 'Checkbox';
rtwoptions(oIdx).default = 'off';
rtwoptions(oIdx).enable = 'on';
rtwoptions(oIdx).tlcvariable = 'Foo';
rtwoptions(oIdx).makevariable = 'FOO';
oIdx = oIdx + 1;
rtwoptions(oIdx).prompt = 'Bar only makes sense if Foo is enabled';
rtwoptions(oIdx).type = 'Checkbox';
rtwoptions(oIdx).default = 'off';
if foo <--- WHAT DO I PUT HERE?
rtwoptions(oIdx).enable = 'on';
else
rtwoptions(oIdx).enable = 'off';
end
According to the documentation there is such a thing as a conditional rtwoption by calling a MATLAB function, but I would like to make it dependent on another options.
This must be possible, as it is implemented in Code Generation --> Report tab ("Open report" is only enabled if you enable "Create Report").
What is the syntax of this condition? Can I use the "tlcvariable"?
This is possible using the rtwoptions(i).callback field and a Matlab function that uses slConfigUIGetVal to get the value of the controlling option (Foo in the example) and slConfigUISetEnabled to enable/disable the dependant option (Bar in the example).
Related
I have created a very simple GUI in appdesigner (Matlab) with one dropdown menu. Additionally, I took the code that got generated (under 'Code View' tab) and pasted that in a normal .m file (because, I want to further add some more contents to this code). My question is how can I access certain variable from this self generated code, so that I can play with that value outside of the main class?
For example:
In App class, for this dropdown menu section, following line of code got generated:
app.ColorDropDown = uidropdown(app.UIFigure);
app.ColorDropDown.Items = {'Red', 'Blue', 'Yellow'};
app.ColorDropDown.Position = [277 178 140 22];
app.ColorDropDown.Value = 'Red';
Outside of this app class: Depending upon the value that was selected in this dropdown menu, I want to capture that in a normal variable, and show some other results based on the color selected
Thanks
It seems like the essence of your question is about sharing data between GUIs as you state you want to "show some other results based on the color selected".
Note: MATLAB documentation cautions: Do not use UserData property in apps you create with App Designer.
The documentation goes on to recommend approaches for sharing data among app designer apps and creating multiwindow apps in app designer.
For the sake of completeness, I'll provide a detailed example, different from the MATLAB documentation, of how this can be accomplished entirely within the App Designer.
Setup
I created 2 app designer apps, controlGUI.mlapp and plotGUI.mlapp. Running controlGUI() loads both mlapp files at once and then allows you to control aspects of the plotGUI from callbacks in the controlGUI. Of course, the plotGUI could do anything but I have it changing visual aspects of the plotted data.
Details
For simplicity, I am setting the controlGUI be the main application. I can do this be adding a property in controlGUI named PlotWindow and having it contain the output of calling plotGUI(); the other mlapp. I also have a callback function I recycle for the three dropdowns that updates a DATA property in the plotGUI. This DATA property has a listener attached that fires a callback to update the uiaxes object.
The plotGUI
The magic is really in this object. That is, I created a property named DATA and altered the access. By setting the property access SetObservable = true, we can then add a PostSet event listener, which I stored in a private property called dataChangedListener during the startupFcn.
properties (Access = public, SetObservable=true)
DATA % A struct with xdata, ydata, fields. Other line prop fields ok
end
properties (Access = private)
dataChangedListener % listener object for when DATA is changed.
end
Then the startup function, startupFcn, initializes the DATA property with some (arbitrary) data as struct then adds and enables the PostSet listener.
% Code that executes after component creation
function startupFcn(app, data)
if nargin < 2
% create a default dataset
data = struct();
data.xdata = linspace(0,1,1001);
data.ydata = sin(data.xdata.*2*pi*10);%10hz signal
data.color = app.Axes.ColorOrder(1,:);
end
app.DATA = data;
% plot the data
line(data, 'parent', app.Axes);
% add and enable PostSet event listener for the DATA property
app.dataChangedListener = addlistener(...
app,'DATA','PostSet', ...
#(s,e) app.updatePlot ...
);
app.dataChangedListener.Enabled = true;
end
The PostSet listener calls the method app.updatePlot(), so we have to add this method to our app. This method will get called whenever anything in app.DATA gets modified. So I created the "function" (as the Code Browser calls it) which simply deletes the axes children (the existing line) and uses the low-level version of line() to draw a primitive line based on the app.DATA struct object:
function updatePlot(app)
%clear plot
delete(app.Axes.Children);
% draw the new plot
line(app.DATA, 'parent', app.Axes);
end
Yes, line() will accept a struct which has field names that correspond to valid line properties but I can't seem to find the reference specifically. But if you read about the inputParser object... sorry, getting off topic.
The controlGUI
This object is simpler. It holds the plotGUI in a property, allowing direct access to the plotGUI properties and public methods.
properties (Access = public)
PlotWindow = plotGUI() % holds the reference to the plot window
end
I also created an updatePlot callback method here, different from the plotGUI method, bad naming on my part. Nonetheless, this control method takes the values from controlGUI dropdowns and then modifies the plotGUI DATA struct, stored in app.PlotWindow.DATA. So this one callback is called whenever any of the dropdowns are changed (ValueChangedFcn). Consequently, the PostSet listener for the DATA struct will fire the callback to update the plot accordingly.
% Value changed function: LineColor, LineStyle, MarkerStyle
function updatePlot(app, event)
mStyle= app.MarkerStyle.Value;
lStyle= app.LineStyle.Value;
lColor = app.LineColor.Value;
d = app.PlotWindow.DATA;
switch mStyle
case 'none'
d.marker = 'none';
case 'circle'
d.marker = 'o';
case 'diamond'
d.marker = 'diamond';
case 'point'
d.marker = '.';
end
switch lStyle
case 'none'
d.linestyle = 'none';
case 'solid'
d.linestyle = '-';
case 'dashed'
d.linestyle = '--';
case 'dotted'
d.linestyle = ':';
end
d.color = lColor;
% set the data back into the plotGUI
% The plotGUI's DATA PostSet listener will update the actual plot
app.PlotWindow.DATA = d;
end
You aren't supposed to copy/paste the code outside of the code editor with App Designer. If you want to add your own code, you should add a new function to your class using the "Function" button in App Designer. The app can also call any other matlab function so you could just pass the information from the app to another function by calling it inside the App Designer code
For example see this example from a demo I created. It uses a drop down ChartTypeDropDown to determine what type of chart it should draw. I added a new function called DrawChart which uses the data from the GUI to draw a graph depending on the values selected/entered in to the various boxes.
function results = DrawChart(app)
chartType = app.ChartTypeDropDown.Value;
chartTime = app.TimeEditField.Value;
chartA = app.AEditField.Value;
chartB = app.BEditField.Value;
chartC = app.CEditField.Value;
t = [0:0.1:chartTime];
if strcmp(chartType,'Sin')
y = chartA * sin(chartB*t)+chartC;
elseif strcmp(chartType,'Cos')
y = chartA * cos(chartB*t)+chartC;
elseif strcmp(chartType,'Exp')
y = exp(t);
else
y = x;
end
ax = app.UIAxes;
ax.Title.String = chartType;
plot(ax,t,y);
end
This function is called by the callback linked to a button
function DrawButtonPushed(app, event)
DrawChart(app);
end
Note how I call regular matlab functions such as sin/cos/exp. These could just as easily be a Matlab function that you have written.
We have a script that defines values to names similar to #define in c. For example:
script.m:
ERR_NOERROR = 0;
ERR_FATAL = 1;
This script already exists and is used for value replacement when reading data from files.
Now we have a function (or more) that does some analysis and we would like to use the same definition in this function to avoid magic numbers. But when the script is called from the function we get an error.
Attempt to add "ERR_NOERROR" to a static workspace.
See MATLAB Programming, Restrictions on Assigning to Variables for details.
And this does not help much in the understanding of the problem.
The question is how can we make these definitions visible/usable in the functions with having to copying it every time.
Example:
function foo = bar(a)
run(script.m) %also tried running it without the run command
if a == ERR_NOERROR
foo = 5;
else
foo = 6;
end
end
edit:
There was a nested function,below in the function which I was not aware of. This explains the problem.
This kind of scoping error happens when you use nested or anonymous function within a function. The solution is well documented.
To your case, you can avoid nested function, or "Convert the script to a function and pass the variable using arguments", as the documentation suggests.
EDIT: I should have made it clear that the error occurs even if the script is not called within the nested function. Similar scenario is that, in debug mode (by setting up a break point), it will be an error if one tries to create a temporal variable to test something.
This is not a direct answer, rather a recommendation to switch to another method, which will not be mixing scope and workspace.
Instead of defining your constant in a script, you could make a class containing only constant properties. ex: code for error_codes.m:
classdef error_codes
% ---------------------------------------------------------------------
% Constant error code definition
% ---------------------------------------------------------------------
properties (Constant = true)
noerror = 0 ;
fatal = 1 ;
errorlvl2 = 2 ;
errorlvl3 = 3 ;
warning = -1 ;
% etc ...
end
end
I use this style for many different type of constants. For tidiness, I groups them all in a Matlab package directory (The directories which starts with a + character.
The added benefit of using constant class properties is the safety that the values cannot be changed in the middle of the code (your variables defined in a script could easily be overwritten by a careless user).
So assuming my file error_codes.m is placed in a folder:
\...somepath...\+Constants\error_codes.m
and of course the folder +Constants is on the MATLAB path, then to use it as in your example, instead of calling the script, just initialise an instance of the class, then use the constant values when you need them:
function foo = bar(a)
ERR = Constants.error_codes ;
if a == ERR.noerror
foo = 5;
else
foo = 6;
end
or it can works in switch statement too:
switch a
case ERR.noerror
foo = 5 ;
case ERR.warning
foo = 42 ;
case ERR.fatal
foo = [] ;
end
I have some code and i want to create Property Note
var metric as EA.Element;
metric = thePackage.Elements.AddNew("", "Text");
What i should put instead of Text to add what i want?
I tried:
metric = thePackage.Elements.AddNew(text, "Property Note");
or
metric = thePackage.Elements.AddNew(text, "PropertyNote");
Edit:
metric = thePackage.Elements.AddNew(text, "Note");
does not work:
I am expecting
in the red box, not the element above it.
Answer:
metric = thePackage.Elements.AddNew("", "Text"); // the Note Property
metric.SubType = 18; // This will actually make a simple Text behave as Note Property
As promised here's the code to create a Diagram Note. Sorry for the Perl, but you'll likely be able to translate this to Javascript.
my $p = $rep->GetPackageByGUID("{157B01A5-8F9A-4458-8C7F-E48F5DA77B0A}"); # sample package
my $dnote = $p->Elements->AddNew("", "Text"); # the Note Property
$dnote->{SubType} = 18; # This will actually make a simple Text behave as Note Property
$dnote->Update(); # save in package elements
my $dia = $p->Diagrams->GetAt(0); # sample diagram
my $do = $dia->DiagramObjects->AddNew("l=10;r=110;t=-20;b=-80", ""); # place Note Property in diagram (coordinates are about top left)
$do->{ElementID} = $dnote->ElementID; # link with the Note Property
$do->Update(); # place in diagram
$rep->ReloadDiagram($dia->DiagramID); # make ir appear instantly
I have a situation in MATLAB where I want to try to assign a struct field into a new variable, like this:
swimming = fish.carp;
BUT the field carp may or may not be defined. Is there a way to specify a default value in case carp is not a valid field? For example, in Perl I would write
my $swimming = $fish{carp} or my $swimming = 0;
where 0 is the default value and or specifies the action to be performed if the assignment fails. Seems like something similar should exist in MATLAB, but I can't seem to find any documentation of it. For the sake of code readability I'd rather not use an if statement or a try/catch block, if I can help it.
You can make your own function to handle this and keep the code rather clear. Something like:
swimming = get_struct(fish, 'carp', 0);
with
function v = get_struct(s, f, d)
if isfield(s, f)
v = s.(f); % Struct value
else
v = d; % Default value
end
Best,
From what I know, you can't do it in one line in MATLAB. MATLAB logical constructs require explicit if/else statements and can't do it in one line... like in Perl or Python.
What you can do is check to see if the fish structure contains the carp field. If it isn't, then you can set the default value to be 0.
Use isfield to help you do that. Therefore:
if isfield(fish, 'carp')
swimming = fish.carp;
else
swimming = 0;
end
Also, as what Ratbert said, you can put it into one line with commas... but again, you still need that if/else construct:
if isfield(fish,'carp'), swimming = fish.carp; else, swimming = 0;
Another possible workaround is to declare a custom function yourself that takes in a structure and a field, and allow it to return the value at the field, or 0.
function [out] = get_field(S, field)
if isfield(S, field)
out = S.(field);
else
out = 0;
end
Then, you can do this:
swimming = get_field(fish, 'carp');
swimming will either by 0, or fish.carp. This way, it doesn't sacrifice code readability, but you'll need to create a custom function to do what you want.
If you don't like to define a custom function in a separate function file - which is certainly a good option - you can define two anonymous functions at the beginning of your script instead.
helper = {#(s,f) 0, #(s,f) s.(f)}
getfieldOrDefault = #(s,f) helper{ isfield(s,f) + 1 }(s,f)
With the definition
fish.carp = 42
and the function calls
a = getfieldOrDefault(fish,'carp')
b = getfieldOrDefault(fish,'codfish')
you get for the first one
a = 42
and the previous defined default value for the second case
b = 0
I am trying to implement save/load functions in a MATLAB (R2009a) UI. My object implements a layout function that generates a user interface for the object. I am trying to implement the callbacks for the save/load buttons. The save button works and save the object out to a MAT file which can be loaded later.
My problem is implementing the callback for the load button. I cannot seem to get the load to load the data from the MAT file and update the properties of the new object. Any suggestions on where I am going wrong along with suggestions on how I might proceed is greatly appreciated.
The important code is my class definition file of course my actual object implements many more properties and methods but here is a skeleton of what I have
classdef myObj<handle
properties
image % property holds a matlab image matrix
objCount % number of objects in image
end
properties(Transient=true)
parent
children
end
methods
function myObj
% empty constructor
end
function load_object(self)
% ask user for file
[fileName, pathToFile]=uigetfile('*.mat','Select .mat file');
tmp = load(fullfile(pathToFile,fileName);
if isfield(tmp,'obj')
self = tmp.obj;
end
end
LayoutFcn(self) % UI layout function
end
end
The UI layout is defined in a seperate file LayoutFcn.m which basically looks like
function LayoutFcn(self)
% create figure window and add various UI elements
...
% create load button
self.children(end+1) = uipushtool('Parent',hToolbar, ... % set parent to current toolbar
'CData',iconRead('open-document.png'), ... % read icon image from file
'Tag','uiLoad', ...
'ClickedCallback',#(hObj,event)loadingMyObject(self,hObj,event));
% create save button
self.children(end+1) = uipushtool('Parent',hToolbar, ... % set parent to current toolbar
'CData',iconRead('save-document.png'), ... % read icon image from file
'Tag','uiSave', ...
'ClickedCallback',#(hObj,event)savingMyObject(self,hObj,event));
...
end
function loadingMyObject(self,hObj,event)
self.load_object; % call load_object method defined above in class definition
end
function savingMyObject(self,hObj,event)
[fileName,pathName]=uiputfile('.mat','Save object to MAT file');
obj = self;
save(fullfile(pahtName,fileName),'obj')
end
Note: I am using MATLAB R2009a.
The code doesn't throw any errors. The way I wrote the code the parent object (represented by self) does not get updated after the call to LOAD in the method load_object. SO, this has the desired effect:
>> var = myObj;
>> var.load_object;
However, if I use the loadingMyObject callback defined in LayoutFcn.m in this fashion
>> var = myObjl
>> var.LayoutFcn
-> click Load button to call _loadingMyObject_
doesn't affect var properties. That is var will still have its default property values after clicking the Load button.
Changing the load methods to use set as suggested by gnovice throws the following error
??? Error using ==> set
Conversion to double from FujiCalibration is not possible.
even though I have set/get methods for each property; as in
method set.image(self,II)
% ... some data validation code ...
self.image = II
end
Using a loop to set each field as suggested by Mr Fooz is not really an option as my full class has public constant that throw an error when they are set.
I am looking for a solution that would avoid me having to hand code setting each field individually. Although at this point it seems like the only possibility.
I believe Mr Fooz is right. The self variable passed to load_object is an object of type "myObj", but the line:
self = tmp.obj;
is simply overwriting the self variable with the structure stored in tmp.obj. Doing:
self.image = tmp.obj.image;
should instead invoke a set operator for the image property of object self. In the MATLAB documentation there is a sample class definition with a method called "set.OfficeNumber" that illustrates this.
In addition, the following line in your function savingMyObject may be unnecessary:
obj = self;
I think it might make most sense (and make the code a little clearer) if you used the name "obj" in place of the word "self" within your class code (as the documentation tends to do). "self" doesn't appear to be any kind of special keyword in MATLAB (like it may be in other languages). It's just another variable as far as I can tell. =)
EDIT #1:
If the prospect of having to set each property individually in your load_object method doesn't sound like fun, one way around it is if you have a SET method for your object that is designed like the SET method for handle graphics. That SET command can accept a structure input where each field name is a property name and each field value is the new value for that property. Then you would have one call like:
set(self,tmp.obj);
Quite a bit shorter, especially if you have lots of properties to set. Of course, you'd then have to write the new SET method for your object, but the shortened syntax may be worth the extra work if it comes in handy elsewhere too. =)
EDIT #2:
You may be able to use the loop Mr Fooz suggested in conjunction with a try/catch block:
fn = fieldnames(tmp.obj);
for i = 1:numel(fn),
try
self.(fn{i}) = tmp.obj.(fn{i});
catch
% Throw a warning here, or potentially just do nothing.
end
end
Don't assign values to self. All that does is replace the binding to the self variable in the scope of the method call. It does not call a magical copy constructor to replace the object reference in the caller. Instead, copy the fields into self. Try something like:
if isfield(tmp,'obj')
self.image = tmp.obj.image;
self.objCount = tmp.obj.objCount;
end
Combining Mr Fooz's and gnovice's suggestions, I added a SET function with the following definition
function set(self,varargin)
if isa(varargin{1},'FujiCalibration')
tmp = varargin{1};
fns = fieldnames(self);
for i = 1:length(fns)
if strcmpi(fns{i}(1:2),'p_')
self.(fns{i}) = tmp.(fns{i});
end
end
self.calibImage = tmp.calibImage;
else
proplist=fields(self);
for n=1:2:length(varargin)
tmp = proplist(strcmpi(proplist,varargin{n}));
value = varargin{n+1};
switch length(tmp)
case 0
msg = char(strcat('There is no ''', varargin{n}, '''property'));
error('FujiCalibration:setPropertyChk',msg)
case 1
tmp = char(tmp);
self.(tmp) = value;
end
end
end
end
I then modified the load_object method as suggested by gnovice by changing
self = tmp.obj
to
set(self,tmp.obj).
I need to make sure that properties with values I want to persist are prefixed with 'p_'.
Thanks to gnovice and Mr Fooz for their answers.