MATLAB: Send Variable to Workspace In Middle of a Function

MATLAB

Is there a way to return a variable to the workspace in the middle of a function? I do not want to create two separate functions in order to do this.

Best Answer

You can use the 'assignin' function. It allows you to assign a variable to a workspace in the middle of a function. If you wish to save multiple variables, you can either make a call to 'assignin' multiple times or save the variables in a container like a cell array or structure. You can refer to the documentation here.

https://www.mathworks.com/help/matlab/ref/assignin.html

To test this, write a function, debug the function, execute the 'assignin' line, and quit debugging. You will see the variable saved in the specified workspace even though the function did not fully execute.

Related Solutions

MATLAB: Does evalin(…, assignin(…)) not work in MATLAB R2015b and more recent versions

This is actually the expected behavior, as "evalin" and "assignin" cannot be used recursively to reach more than one level deep in the function call stack.

For more information, see the 'Limitation' section of the "evalin" documentation page:

https://www.mathworks.com/help/matlab/ref/evalin.html

This change was made in MATLAB R2015b (so R2015a and earlier versions have the old behavior you observed in R2014b) to standardize the behavior of "evalin".

As a workaround for MATALB R2015b and more recent versions, you can change the line

>> evalin('base','assignin(''caller'',''varName'',varName)');

>> varName = evalin('base', 'varName');

which will create a new variable, 'varName', in your function workspace with the same value as 'varName' in the base workspace.

MATLAB: How to middle

If you have only circle on the image like below

clc,clear
I = imread('img.png');
I1 = im2bw(I,graythresh(I));        % binarize image (0,1)
[row, col] = find(I1);              % find white pixels (1 value)
ix = round( mean(col) );            % mean column
iy = round( mean(row) );            % mean row
imshow(I1)
hold on
plot(ix,iy,'or')
text(ix+10,iy+10,'CircleCenter')
hold off

Best Answer

Related Solutions

MATLAB: Does evalin(…, assignin(…)) not work in MATLAB R2015b and more recent versions

MATLAB: How to middle

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