Unrecognized function or variable 'size'. in function called from script

Question

Katharina Heitger 2021-8-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1435992-unrecognized-function-or-variable-size-in-function-called-from-script

评论： Katharina Heitger 2021-8-19

采纳的回答： Walter Roberson

weightingFkt2.m

在 MATLAB Online 中打开

The Problem:

I have a script, where I call two self-written functions. One of the functions is called weightingFkt2(). In this function I call the find() function of Matlab, which returns indexes. Now, if I want to call indexsize=size(index,2) I get an error "Unrecognized function or variable 'size'." while running the code.

What I have already done (besides researching):

I checked in the weightedFkt(), if it is a matrix. It is.

If I write the same line (indexsize=size(index,2);) in the command window after getting the error (I told matlab to pause on errors) it works fine.

I got the same error on different variables in the same function before. There I was able to put the call of size() into the script, where it worked fine.

I use Matlab R2019b.

The relevant lines of code in the functioin I attach, the line where I get the error is line 43, the lines where I got errors, but was able to put the line in the script are 5,6 and 17.

In the script the relevant lines of codes are:

origsize1=size(origimage,1);
origsize2=size(origimage,2);
newsize1=round(origsize1*1.25);
newsize2=round(origsize2*1.25);
        for x=1:newsize1
            for y=1:newsize2
                %findnearestindeces: finds the nearest points in valuepixels
                %of x and y
                nearestindex=findnearestindeces(x,y,valuepixels(:,:,:)); %valuepixels: valuepixels(s,t,:)=[currentPoint(1), currentPoint(2), neworigimage(s,t)];
                size3=size(nearestindex,1); %due to error message in weightingFkt() now in script
                cp=[x y];
                imagevalue=weightingFkt2(nearestindex, cp, valuepixels, size3);
                finalimage(x,y)=imagevalue;
            end
        end
     

So my question is, how I can solve that.

As that is my first question in this forum I tried to follow all the guidelines and add all the relevant code but please let me know, if something is missing.

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Walter Roberson 2021-8-18

I wonder if the error is against nearestindex instead of against size? If length1 < 1 then you never assign to nearestindex

Katharina Heitger 2021-8-18

Thank you for your answer.

length1 is 4, since nearestindex is of 4x2 double.

I already asked myself a similar question, not that nearestindex is not assigned, but I checked and looked. All of the 8 values (4x2) are double and it is a matrix. In fact they have values like ([412 1]; [1 1]; [514 1]; [413 1]).

And the find() function returns a value, in this case a 1x1 double, but nevertheless.

And everytime I get this error, and I run the size() command int the command window I works out fine.

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Answer 1

Walter Roberson 2021-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/1435992-unrecognized-function-or-variable-size-in-function-called-from-script#answer_770399

在 MATLAB Online 中打开

Near the bottom of the script you have

size=size(nearestindex);

Because you assign to the variable size, MATLAB assumes that size must be a variable everywhere in the script.

Do not use the same name as both a function and a variable: MATLAB is permitted to make these kinds of assumptions now.

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Katharina Heitger 2021-8-19

Thank you! Now I'm really embarassed... I double or triple checked the code, with my eyes and with who. But that I overlooked. Thank you again!

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Answer 2

Chunru 2021-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/1435992-unrecognized-function-or-variable-size-in-function-called-from-script#answer_769452

编辑：Chunru 2021-8-18

Most likely, somewhere in your code you use "size" as a varibale name. Try "debstop error"; When error occurs, use "whos" to see if "size" is in the variable list.

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Katharina Heitger 2021-8-19

You said, I should copy the function name to the command window. Do you mean the name of my self-written fucntion or the size()-function? The size()-function works via the command window fine.

Output of the which command, so the path of the function is:

built-in (C:\Program Files\MATLAB\R2019b\toolbox\matlab\elmat\@double\size) % double method

In my opinion this looks fine, but maybe it isn't?

Katharina Heitger 2021-8-19

So I copied the name of the self-written function into the command window and had a breakpoint right before the error occurs. Here I entered 'size'+0 into the command window, where the ouput was:

ans =

115 105 122 101

And the the error occured. But I don't think, that this was what you meant.

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