Sum of values stored in an array of handles

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Juri Augsburger 2020-4-1

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评论： Juri Augsburger 2020-4-2

I got the following callback function

function solveclick(bl)                     %bl is an array of handles to pushbuttons (created with uicontrol)
    for i=2:10
        rows(i)=sum(get(bl(i,:),'value'));
    end
end

What I'm trying to do is add the values of the pushbuttons in a row and store the individual sums in a vector called rows.

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Answer 1

Image Analyst 2020-4-1

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Are you SURE you set the Value property of the buttons when you created them? You'd need to have done that for your code, though I think it's unusual. Most people would set the UserData property, or just keep a separate array for whatever numbers you want to store. Are you using GUIDE or App Designer?

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Juri Augsburger 2020-4-2

>> get(bimarugui(2,1),'userdata')

ans =

0

>> whos ans

Name Size Bytes Class Attributes

ans 1x1 8 double

bimarugui is the handle outside the function.

when i run the function and look what's in userdata I get the right answer (a double variable)

I believe there's a problem with the "(1,:)" notation, but how to write this differently?

The error message displayed:

Error using sum

Invalid data type. First argument must be numeric or logical.

Error in BimaruGUI>solveclick (line 156)

rows(i)=sum(get(bl(i,:),'userdata'));

Error while evaluating UIControl Callback.

Juri Augsburger 2020-4-2

I got it!! cell2mat before get(...) !

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Answer 2

Geoff Hayes 2020-4-1

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Juri - the only problem that might exist for you (it did for me when i tried this) was that

get(bl(i,:),'value')

returned a cell array of numeric values which, when trying to sum that array, I observed a Undefined function 'sum' for input arguments of type 'cell' error message. To get around this, you would need to convert to a matrix

rows(i)=sum(cell2mat(get(bl(i,:),'value')));