None of the output variables are saved in workspace,when running by function, but saves when running without function (by directly assigning input data in script)

 %function m =feature(x,N)
x=tr_data(1:8,:);
N=8;
[row col]=size(x)
rre=zeros(32,32,5);
for i=1:1:row
r=x(:,1:1024);
g=x(:,1025:2048);
b=x(:,2049:3072);
rre(:,:,i)=reshape(r(i,:),32,32);
gre(:,:,i)=reshape(g(i,:),32,32);
bre(:,:,i)=reshape(b(i,:),32,32);
if N==4
r1(:,:,i)=mat2cell(rre(:,:,i),[32/2,32/2],[32/2,32/2])
g1(:,:,i)=mat2cell(gre(:,:,i),[32/2,32/2],[32/2,32/2])
b1(:,:,i)=mat2cell(bre(:,:,i),[32/2,32/2],[32/2,32/2])
elseif N==8
r1(:,:,i)=mat2cell(rre(:,:,i),[32/4,32/4,32/4,32/4],[32/2,32/2])
g1(:,:,i)=mat2cell(gre(:,:,i),[32/4,32/4,32/4,32/4],[32/2,32/2])
b1(:,:,i)=mat2cell(bre(:,:,i),[32/4,32/4,32/4,32/4],[32/2,32/2])
elseif N==16
r1(:,:,i)=mat2cell(rre(:,:,i),[32/4,32/4,32/4,32/4],[32/4,32/4,32/4,32/4])
g1(:,:,i)=mat2cell(gre(:,:,i),[32/4,32/4,32/4,32/4],[32/4,32/4,32/4,32/4])
b1(:,:,i)=mat2cell(bre(:,:,i),[32/4,32/4,32/4,32/4],[32/4,32/4,32/4,32/4])
elseif N==32
r1(:,:,i)=mat2cell(rre(:,:,i),[32/8,32/8,32/8,32/8,32/8,32/8,32/8,32/8],[32/4,32/4,32/4,32/4])
g1(:,:,i)=mat2cell(gre(:,:,i),[32/8,32/8,32/8,32/8,32/8,32/8,32/8,32/8],[32/4,32/4,32/4,32/4])
b1(:,:,i)=mat2cell(bre(:,:,i),[32/8,32/8,32/8,32/8,32/8,32/8,32/8,32/8],[32/4,32/4,32/4,32/4])
else
    disp('invalid N');
end
end
[sz1,sz2,sz3] = size(r1);
[sz4,sz5,sz6] = size(g1);
[sz7,sz8,sz9] = size(b1);
data=sz1*sz2*sz3;
datagreen=sz4*sz5*sz6;
datablue=sz7*sz8*sz9;
%fr=zeros(2,2,5);
fr=zeros(sz1*sz2,sz3);
fg=zeros(sz4*sz5,sz6);
fb=zeros(sz7*sz8,sz9);
for k=1:sz1
% for l=1:sz2
for m=1:data
fr(m)=mean2(r1{m});
fg(m)=mean2(g1{m});
fb(m)=mean2(b1{m});
end
end
fr=fr';
fg=fg';
fb=fb';
end

[Stephan]

Which variables should be saved in workspace?

[Stephen23]

You defined your function to return one output argument, the variable m:

function m =feature(x,N)

The variable m is the loop iterator for a loop... is this the only output that you want to return?

[madhan ravi]

after running this function , my Matlab crashed no variables are saving in my workspace now

[Kalai Arasi Mehavarnam]

That problem occurred for me too and when I copied to another fresh script, it was OK but still the variables was not saved

Answer 1

[Stephan]

Hi,

if i assume you want fr, fg and fb as result in workspace change the function declaration to:

function [fr, fg, fb] = feature (x,N)

If this is done call the function the following way:

[fr, fg, fb] = feature (x,N)

Then you get the 3 variables as result to workspace.

By the way: I saw that you have got answers that worked for you. Please accept helpful answers in order to help people with similar Problems find helpful answers. Also this is somehow a kind of reward for the volunteer contributers here, which solve problems.

Best regards

Stephan

[Kalai Arasi Mehavarnam]

Yeah Thank you, I have written code as [f]=[fr,fg,fb]; but still the variables rre,gre,bre,r1,g1,b1,fr,fg,fb,f; nothing saved in workspace. but assigning inputs in the script directly saves every output in workspace.Kindly help me to fix it out while running in the fuction.

[Stephan]

Every variable inside a function is in a capsuled seperate Workspace for this function and not inside the base Workspace. Every variable you want the function to give it to the base workspace has to be an output argument of the function.

Simply expand the first line and the function call according to your requirements:

function [rre,gre,bre,r1,g1,b1,fr,fg,fb] = feature (x,N)

and to call the function:

[rre,gre,bre,r1,g1,b1,fr,fg,fb] = feature (x,N)

The scheme is always the same - if you need to adapt or extend it.

[madhan ravi]

+1 @stephen new information lear'nt from your latter comment thank you for explaining

[Kalai Arasi Mehavarnam]

I want only the feature [f] to be the output that contains the rgb features, based on sub-image size 'N'.I wanted to perform f for various N=4,8,16,32. Then using the output f(mean features) in another function which executes mvnpdf. Still, the other mid variables have to be stored in the work-space.

[Stephan]

I can not find a variable f in your code - or do i miss something here? There should be a line:

f = ...;

I did not find such a line. But as i said - if you just want to have this variable use:

function f = feature (x,N)

and then call it with:

f = feature (x,N)

If there is only one variable you do not need the brackets.

[Kalai Arasi Mehavarnam]

I did as you said in here, what you see is my previous uncorrected code.As per your suggestion after assigning them in output function, its working and now the work space has all the variables. Thank you so much

[Stephan]

Glad to hear