I have done the following:
I=imread('image.png');
I2=im2double(I);
cidx = fcm(I2,5);
When I tried running the following command:
silhouette(I2,cidx)
I got the following error:
Error using grp2idx (line 39)
Grouping variable must be a vector or a character array.
Error in silhouette (line 79)
[idx,cnames] = grp2idx(clust);
How can I solve this issue?
Thanks.
With problems like this, you want to work backwards through the errors. It states
Grouping variable must be a vector or a character array.
and obviously it is the variable clust that it is complaining about. So look at the file silhouette, and figure out what the variable clust is set to. I am imagining it is not a vector…
When you turn on the debugger to stop on error, you will be "in the function" where the error occurs and then you can examine the variables, move up and down the stack, and figure out exactly what went wrong.
If you still need more help, let us know what you got when you typed
whos clust
in the context of silhouette.
Related
I'm developing a system in modelica and i have a big problem.
When i run the simulation in terminal, it display this error:
"Dimension 2 has bounds 1...3, got array subscript 0".
I suppose that an array declaration have an index out of bound, but no one of them have it. I don't know what to do. I'll leave the code here, i hope someone can help me
https://github.com/BigMautone/Drones.git
probably, the error is located in psoControllor.mo or drone.mo or collisionAvoidance.mo or System.mo
I have a struct as shown in picture, and I need to address one of the columns in a FOR loop, as shown. But I keep getting this error:
Function 'subsindex' is not defined for values of class 'struct'.
Error in analisa_arx_teste (line 351)
In my case, what i want is :line 1 represents i = 1, line 2 i =2; So, for features, When I ask for pref_estemod(i).features is to get the values from the field features associated to each model.
I am just starting programming with matlab, so all your help would be appreciated.
Thanks!
for i=pref_estemod(1:npreferred)
[m,n]=size(Training);
features=(pref_estemod(1,i).features);
end
The error lies in i=pref_estemod(1:npreferred).
If you intend to use i for indexing, the syntax is for i=1:npreferred.
1:npreferred itself expands to the horizontal array [1,2,...,npreferred]. = with a leading for is a special syntax combination. It means do the following code with i=1, i=2, ..., i=npreferred. Now I am sure you already know the idea behind for loop. The reason I write all this is to give you the following warning/advise. Do NOT expect the same syntax to work with non-numeric arrays. Because it works in some cases and not others.
I have created a matlab GUI in which a user selects a variable to integrate with respect to, inputs the equation, and lower and upper limits. When my code goes to calculate the integral on pushbutton Callback, I get an error I don't understand.
This is the line of code causing the error:
i1 = int( eval(get(handles.edit1,'string')),
(handles.respectvar),
get(handles.edit3),
get(handles.edit2)
);
%respactvar is the user-selected variable, and edit3 and edit2 are the lower and upper limits.
And this is the error message:
Error using sym>tomupad (line 1135)
Conversion to 'sym' from 'struct' is not possible.
Error in sym (line 151)
S.s = tomupad(x);
Error in sym/int (line 142)
b = sym(b);
Error in projectCALC>pushbutton1_Callback (line 376)
i1=int(eval(get(handles.edit1,'string')),(handles.respectvar),get(handles.edit3),get(handles.edit2));
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in projectCALC (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in #(hObject,eventdata)projectCALC('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating UIControl Callback
Thank you!
There are multiple problems with your code.
The first problem, as #excaza noted, is that you forgot to get the string property of the last two edit boxes, while you did this for the first one.
The second problem is that eval is very inefficient, and, in your case, very unsafe. What if somebody wrote a system() call into the editbox, erasing your hard drive?
The third problem is that even with eval or str2func, int requires its first argument to be a symbolic expression. This is a good thing: you don't actually have to use eval, you just have to convert your first string to a sym.
The fourth problem is that handles.respectvar also seems to be a GUI object, so you might need to get() some property for it in order to be able to use it as an integration variable.
Assuming that my suspicion is correct, and your edit1 contains a string like '3*x+y', edit2 and edit3 are limits such as '1' and '3', and handles.respectvar has a property that evaluates to 'x', then you should be calling
formula = sym(get(handles.edit1,'string'));
variable = handles.respectvar; %// more likely: get(handles.respectvar,...)
lim1 = str2double(get(handles.edit3,'string'));
lim2 = str2double(get(handles.edit2,'string'));
i1 = int(formula,variable,lim1,lim2);
A few notes:
Don't be afraid of using temporary variables where it helps in readability.
I converted the formula from sym to string, otherwise you get a warning or an error (depending on MATLAB version)
I left the order of lim1 <-> edit3, lim2 <-> edit2. Make sure this is indeed what you want, and orders are not reversed.
I converted the integration limits to double, but it seems that sym/int will also accept string input as the limit variables, so this is mostly for clarity.
I'm trying to write a bit of code of to make MATLAB scatter plots from variables in a structure. I want to give the code the name of the structure (there will be many of these structures) and then get it to make a scatter plot of two variables. When I try the code below I get an error message saying, "??? Error: File: make_graphs.m Line: 6 Column: 9
The input character is not valid in MATLAB statements or expressions."
str2stuct= input('Please enter the string for the struct e.g. TMB_RUN_1_data:');
test1=strcat(str2stuct,'.NDROP_max');
test2=strcat(str2stuct,'.input_kappa');
scatter($(test2), $(test1))
I thought that the error message probably meant that I was using the dollar sign in a way which MATLAB doesn't approve of (I've yet to find much use for $ in MATLAB).
I tried it like this:
str2stuct= input('Please enter the string for the struct e.g. TMB_RUN_1_data:');
test1=strcat(str2stuct,'.NDROP_max');
test2=strcat(str2stuct,'.input_kappa');
scatter((test2),(test1))
And got this error:
"??? Error using ==> scatter at 51
Must supply X and Y data as first arguments.
Error in ==> make_graphs at 6
scatter((test2),(test1)) "
I tried it with changing the last line as shown below but got the same error as with the brackets:
scatter(test2,test1)
If I use the literal name as below it works fine.
scatter(TMB_RUN_1_data.NDROP_max,TMB_RUN_1_data.input_kappa)
I've tried a bunch of other things but I am not getting it. I've tried the mathworks pages on scatter but there are no examples that are close to what I am doing. I am really really stuck.
EDIT: I have found a solution but I am aware that this is not considered best practice. If you can simply explain how to do this better that would be good. Answers should be aimed at a moron in a hurry, not an experienced programmer.
Making this the last line works:
scatter(eval(test2),eval(test1))
I am aware that 'eval' is frowned upon and so this probably isn't a good long term answer, works for now. This seems to be the way to get MATLAB to actually read the contents of the strings test1 and test2 into the lines in question.
I am having problem when I try to store rmabackadj function's output to a variable. The function works properly when no output variable is assigned. This function is part of bioinformatics toolbox.
So the issue is when I try to run the following it works properly:
rmabackadj(myprobeData.PMIntensities)
But when I try to run the following I get an error:
>> A = rmabackadj(myprobeData.PMIntensities)
Warning: Colon operands must be real scalars.
> In rmabackadj>findMaxDensity at 255
In rmabackadj at 164
Error using ksdensity>parse_args (line 162)
X must be a non-empty vector.
Error in ksdensity (line 114)
[axarg,yData,n,ymin,ymax,xispecified,xi,u,m,kernelname,...
Error in rmabackadj>findMaxDensity (line 255)
[f, x] = ksdensity(z, min(z):(max(z)-min(z))/npoints:max(z), 'kernel', 'epanechnikov');
Error in rmabackadj (line 164)
mu = findMaxDensity( o(o < mu));
I searched for it online as well, but I couldn't find any result. Does anybody have any idea about the cause of this error?
PS: When I assign ans variable to a new variable, it is properly assigned.
A = ans
I'm pretty sure this is a bug.
Firstly, the reason it errors only when you supply an output argument is because there's an internal switch in the function that calculates different things based on nargout. That's an odd design, but not necessarily a bug.
Internal to rmabackadj there are two subfunctions findMaxDensity and findMaxDensity2. The main routine calls findMaxDensity, which is supposed to find an initial guess for the parameter mu. However (when I run the documentation example that you mention in your comment), it finds a terrible guess right on the edge, leading to an error.
When I edit the file to call findMaxDensity2 rather than findMaxDensity, it seems to produce a reasonable guess, and runs fine with no error. I can't vouch for whether the guess is actually "correct", but it seems reasonable to me, and it's only functioning as an initial guess to start off a better estimation process. (NB if you do this yourself, make sure to save a copy of the old version first).
I would guess that this is a bug, either that findMaxdensity is generating an unusually poor guess that should be caught, or that really it should be calling findMaxDensity2 and the code has not been updated to call a new subfunction.
Either way, I would report it to MathWorks.
PS I am running MATLAB R2011b. Check first if the issue has been fixed, or behaves differently, in more recent versions.
Mathworks confirmed this bug and issued a work around for it and mentioned this may be fixed in future releases.
One possible workaround is to add the following conditional at line 163 of rmabackadj function
% estimate mu from left-of-the-mode data
if any(o < mu)
mu = findMaxDensity( o(o < mu));
end
The bug for N<1000 samples has been confirmed as well but no work around has been issued yet.
I will update the thread if the work around for N<1000 samples bug.