MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn moreOpportunities for recent engineering grads.

Apply Today**New to MATLAB?**

Asked by Light
on 8 Jun 2013

f = figure('Position',[10 10 600 600]); dat = {-1,1,1;0,-1,0;0,0,-1;1,0,0}; cnames = {'1','2','5'}; rnames = {'1','2','3','4'}; t = uitable('Parent',f,'Data',dat,'ColumnName',cnames,... 'RowName',rnames,'Position',[10 10 590 590]); blnA = logical( A == -1 ); blnOut = find(any(A == -1,2)); rnames{max(blnOut)}; negcolumn = find(A(min(blnOut),:) == 1); cnames{max(negcolumn)}; dU(5)=7; dU(cnames{max(negcolumn)})

Error message occurred. I couldn't find the mistake.(cnames{max(negcolumn)})=5 So it must be dU(5)=7 but error message

Index exceeds matrix dimensions.

*No products are associated with this question.*

Answer by Image Analyst
on 8 Jun 2013

Accepted answer

Perhaps

A = cell2mat(dat);

but I can't figure out what dU is for - it's not being used. Anyway, look at this code:

dU(5)=7; maxValue = max(negcolumn) index = cnames{maxValue} % Gives string '5' dU(5) % Works fine. dU(cnames{max(negcolumn)}) % dU('5') = du(53) which is not defined because dU has only 5 elements.

You can't have the string '5' be the index into an array. Perhaps you wanted cnames to be a cell array that stored integers, not strings:

cnames = {1,2,5};

which works, though I still don't know what you're after.

Answer by Walter Roberson
on 8 Jun 2013

You have not defined dU()

cnames indexed by a number gives you a *string*. Indexing an array by a string is not impossible but seldom gives the expected answer: in your case it would be equivalent to asking for dU([49 50])

You need to remember that '1','2','5' are *strings* and that you almost never index arrays at strings; arrays get indexed at row numbers and column numbers.

If you need to be able to access an array by the *name* of a row, or the *name* of a column, then you need to use the MATLAB database object, which is part of the Statistics toolbox.

Show 2 older comments

Image Analyst
on 8 Jun 2013

See my answer to your new explanation in your duplicate question: http://www.mathworks.com/matlabcentral/answers/78455#answer_88183

## 1 Comment

## the cyclist

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/78442#comment_153794

I cannot run your code, because I do not have the array

A. Is it possible for you to post self-contained code that will execute and show that error?