Create Legend From Array

Hello,

I have an array

 nN = 6;
 N = 1:nN;

I want to make a legend where nN changes and so may not be known ahead of time. I found the following solution on another post, but it doesn't work for me.

legendCell = cellstr(num2str(dope, 'N=%-d'));
legend(legendCell)

I get the error.

Error using legend>process_inputs (line 563)
Cell array argument must be a cell array of character vectors.

Error in legend>make_legend (line 328)
[autoupdate,orient,location,position,children,listen,strings,propargs]
= process_inputs(ha,argin); %#ok

Error in legend (line 282)
    make_legend(ha,args(arg:end),version);

So, I tried

 for iN = 1:nN
      legendCell{iN} = cellstr(['n = ' num2str(N(iN))]);
 end
 legend(legendCell)

which gives a similar error. However, the following does work.

 legendCell = {'n=1', 'n=2', 'n=3', 'n=4', 'n=5', 'n=6'};
 legend(legendCell)

Why does the later work but the others don't?

Answer 1

[Jos (10584)]

In the first two codes, legendCell is a cell array of cells ( = {{..} {...}} ) rather than a cell array of strings (= {'..' '..'})! You have a pair of curly braces too many, as cellstr creates a cell, which you then put into a cell :)

Try this:

 for iN = 1:nN
      legendCell{iN} = num2str(N(iN),'N=%-d');
 end

Answer 2

[KL]

Without a loop maybe,

 legendCell = strcat('N=',string(num2cell(1:nN)))

and then as you might know,

 legend(legendCell)