Let's say I have this hash in Coffeescript:
exercises =
stretchedPrayer:
name: "Stretched Prayer"
sound: "28-stretched-prayer"
bandStretch:
name: "Band Stretch"
sound: "13-band-stretch"
I can correctly get the name of the first exercise with the following code:
exercises.stretchedPrayer.name
What I want to do is call the same name but I will know which exercise I want from a variable extracted from an id on the web page.
In other words, if I have a variable such as
myExercise = "stretchedPrayer"
How can I get the name of the practice in the hash just using this variable?
Just use square brackets, like you would do in JavaScript.
exercises[myExercise].name
object[property] is the same as object.<<property's value>>
Related
I want to create a new map every time the button is pressed.
I want the names of the maps to be regular.
I tried using ${} in the map name but it doesn't seem to work.
is there any solution?
You may think you want this, but you don't. Information and meta-information should remain separate. Very likely, a Map of Maps will accomplish everything you want with dynamic names.
There are a few ways to do this:
Use the sprintf function:
String mapName = sprintf("map_%d", mapNumber);
Use string interpolation:
String mapName = "map_${mapNumber}";
Use a template string:
String mapName = map_${mapNumber};
I have large data sets which i want to work with in matlab.
I have a struct called Trail containing serveral structures called trail1, trail2 ...
which then contain several matrices. I now want to add another point to for instance trail1
I can do that with Trail.trail1.a2rotated(i,:) = rotpoint'; the problem is that i have to do it in a loop where the trail number as well as the a2rotated changes to e.g. a3rot...
I tired to do it like that
name ="trail"+num2str(z)+".a2rotated"+"("+i+",:)";
name = convertStringsToChars(name);
Trail.(name) = rotpoint'
But that gives me the error: Invalid field name: 'trail1.a2rotated(1,:)'.
Does someone have a solution?
The name in between brackets after the dot must be the name of a field of the struct. Other indexing operations must be done separately:
Trail.("trail"+z).a2rotated(i,:)
But you might be better off making trail(z) an array instead of separate fields with a number in the name.
I want to programmatically get a list of available functions in the current MATLAB namespace, as well the available functions in a package. How can this be done?
We can use package metadata for this:
pkgs = meta.package.getAllPackages();
% Or if the specific package name is known:
mp = meta.package.fromName('matlab')
The cell array returned in the 1st case, pkgs, contains objects such as this:
package with properties:
Name: 'Sldv'
Description: ''
DetailedDescription: ''
ClassList: [29×1 meta.class]
FunctionList: [8×1 meta.method]
PackageList: [9×1 meta.package]
ContainingPackage: [0×0 meta.package]
So all that's left to do is iterate through the packages and sub-packages tand collect their FunctionList entries.
I'm not sure how to get the functions that belong to the "default" namespace, other than by parsing the function list doc page, for example using the Python API and BeautifulSoup:
fl = arrayfun(#(x)string(x{1}.string.char), py.bs4.BeautifulSoup( ...
fileread(fullfile(docroot,'matlab','functionlist-alpha.html')), ...
'html.parser').find_all("code")).';
Further to Dev-iL's answer, parsing the function list documentation web page is pretty easy because of the useful "function" class that the web devs have (currently) used to tag each function name with! Each function looks like this within the HTML:
<code class="function">accumarray</code>
So we can use urlread to grab the source, and regular expressions to strip out the inner text of each "function" class item:
str = urlread('https://mathworks.com/help/matlab/functionlist-alpha.html');
funcs = regexp( str, '(?<="function">)[0-9A-Za-z.]+', 'match' );
Note: "alpha" in the URL is for "alphabetical" rather than to denote early testing!
funcs is a cell array with all the function names on that page.
The page used above is for the most recent MATLAB version. For a specific version, use the historic documentation pages structured like so:
https://mathworks.com/help/releases/R2017b/matlab/functionlist.html
How do I take a list of values, iterate through it to create the needed objects then pass that "list" of objects to the API to create multiple rows?
I have been successful in adding a new row with a value using the API example. In that example, two objects are created.
row_a = ss_client.models.Row()
row_b = ss_client.models.Row()
These two objects are passed in the add row function. (Forgive me if I use the wrong terms. Still new to this)
response = ss_client.Sheets.add_rows(
2331373580117892, # sheet_id
[row_a, row_b])
I have not been successful in passing an unknown amount of objects with something like this.
newRowsToCreate = []
for row in new_rows:
rowObject = ss.models.Row()
rowObject.cells.append({
'column_id': PM_columns['Row ID Master'],
'value': row
})
newRowsToCreate.append(rowObject)
# Add rows to sheet
response = ss.Sheets.add_rows(
OH_MkrSheetId, # sheet_id
newRowsToCreate)
This returns this error:
{"code": 1062, "errorCode": 1062, "message": "Invalid row location: You must
use at least 1 location specifier.",
Thank you for any help.
From the error message, it looks like you're missing the location specification for the new rows.
Each row object that you create needs to have a location value set. For example, if you want your new rows to be added to the bottom of your sheet, then you would add this attribute to your rowObject.
rowObject.toBottom=True
You can read about this location specific attribute and how it relates to the Python SDK here.
To be 100% precise here I had to set the attribute differently to make it work:
rowObject.to_bottom = True
I've found the name of the property below:
https://smartsheet-platform.github.io/smartsheet-python-sdk/smartsheet.models.html#module-smartsheet.models.row
To be 100% precise here I had to set the attribute differently to make it work:
Yep, the documentation isn't super clear about this other than in the examples, but the API uses camelCase in Javascript, but the same terms are always in snake_case in the Python API (which is, after all, the Pythonic way to do it!)
I have a cell array of stucts, each containing the personalia of a person. I put it into this function to get them listed in a text file of a chosen name.
function store( filename, persons )
fid = fopen(filename,'w');
for i=1:length(persons)
fprintf(fid, '%s',serialize_person(persons{i}));
end
Now this function works fine: I enter a <1x3 cell> and get out a text file with three listed persons. However, I want to call this function from another:
function process_store()
list=input('Write in the list of persons you want listed: ');
fprintf('\n')
newfile=input('Give the text file a name: ','s');
store(filename,list)
end
Here I enter the name of the <1x3 cell> as before, but I get a error message "Error using input,Undefined function or variable 'persons'."
Why is this? Am I not using the exact same data as Im using in 'store'?
The problem is that the variable persons isn't accessible inside the function process_store. In Matlab (and most other programming languages) functions can't access variables defined in their calling functions. To understand this better, I recommend having a read of the Wikipedia article on levels of scope.
You essentially have two options here:
Make persons a global variable, both in your workspace and in the function process_store, by using the declaration global persons. I wouldn't recommend this.
Use the function evalin to allow process_store to access variables in its parent workspace.
I'd go with option 2 if I were you. It's a little tricky, so let me explain how it works. Let's create a variable persons in the global workspace.
>> persons = {'John', 'Jack', 'Jill'};
Now say we have the following function
function example()
x = input('Give me a variable name: ');
disp(x)
end
What happens if we try to use it?
>> example()
Give me a variable name: persons
Error using input
Undefined function of variable 'persons'
Error in example (line 2)
x = input('Give me a variable name: ');
Oh dear. That's because the function example doesn't have access to the global workspace, which is where persons is defined. But instead, we can store the name of the variable we want to access, and then check out its value in the global workspace by using evalin, like this
function example()
s = input('Give me a variable name: ', 's');
x = evalin('caller', s);
disp(x)
end
Now if we use it:
>> example()
Give me a variable name: persons
'John' 'Jack' 'Jill'
It works as we expected! Great!
Massive disclaimer
There is almost never a good reason to use functions like evalin (or eval, or assignin or any other function that messes around executing strings as code). There's almost certainly a better way of doing what you want to do. But without knowing what it is you're trying to do, it's hard to give you better advice.
At the prompt
Write in the list of persons you want listed:
if you typed
persons
then you would get exactly that error message if the variable persons was not defined.