Accessing and editing workspace values in matlab code

Question

Sadanand 2011-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/11154-accessing-and-editing-workspace-values-in-matlab-code

回答： yasser 2013-11-11

I need to search a variable in workspace and edit its value at some specific index. How do i access, edit that variable and save new value back to workspace. Thanks,

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Answer 1

Friedrich 2011-7-8

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You code looks correct so far (little typo in the assignin command, it must be array instead of arraya). But I think this should be faster since you have to copy one value only:

function test(mystruct)
for i=1:1
    assignin('base','tmp',mystruct(i).value)
    cmd_string = [mystruct(i).name,'(',num2str(mystruct(i).rowIndex),',',num2str(mystruct(i).colIndex),')=tmp;clear tmp'];
    evalin('base',cmd_string)
end
end

I tested it with:

    a = [1 2 3 4]
    mystruct.name = 'a'
    mystruct.rowIndex = 1;
    mystruct.colIndex = 1;
    mystruct.value = 14;
    test(mystruct)

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Sadanand 2011-7-8

thank u so much bro..

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Answer 2

Friedrich 2011-7-8

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I think what you are looking for is the evalin command. So something like

evalin('base','a=3')

Or if you really have to search you can do:

var = evalin('base','whos;')

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Friedrich 2011-7-8

Sure evalin('base',x) throws an error since x is not present it the ML workspace. you have to ways here how to proceed and both are stated above:

1.) assignin('base','ABC',x) %will overwrite variable ABC with the values of x

2.)assignin('base','x',x) %copy the variable in the ML Workspace

evalin('base','ABC(some_index) = x; clear x')

Sadanand 2011-7-8

Sorry to borrow your time again. Here is my actual problem. I have function that takes array of structure. Structure has following fields.

name, rowIndex, columnIndex, value. For each structure in the structure array, i need to get struct.name and search it in workspace and replace value of this workspace variable with struct.value at index struct.rowIndex and struct.colIndex.

Here is what i have written.

function myFuction(mystruct)

for i=1: 2

array = evalin('base', mystruct(i).name);

array(mystruct(i).rowIndex, mystruct(i).colIndex) = mystruct(i).value;

assignin('base', mystruct(i).name, arraya);

clear array;

end

Thank You for your help.

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