MATLAB: Creating legend based on numeric array

MATLABstring manipulation

I have a numeric array, for example:

N = [1 7 14 30 90 180 360];

I want to create a cell array for use in a figure legend:

legendCell = {'N=1','N=7',...,'N=360'}

This is trivial to do with a loop, and I can think of a couple ways that avoid loops that are a bit kludgy. What is the most elegant way?

[The "N=" part is fixed and known. It does not have to be the variable name.]

Best Answer

One more:

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

Related Solutions

MATLAB: Create Legend From Array

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

MATLAB: How to replace char in array with a double

You made a cell array with this line:

letters = cellstr(Roman')'

That is why you are getting the conversion error. Make it a double instead. E.g.,

letters = zeros(size(Roman));

Then in your loop, compare with Roman instead of letters. E.g.,

    if (strcmp(Roman(n),'I'))||(strcmp(Roman(n),'i'))
        letters(n)=1;
    elseif (strcmp(Roman(n),'V'))||(strcmp(Roman(n),'v'))
        letters(n)=5;
            :
           etc

However, this is just a character conversion code. You still need to put in logic for when values are added vs subtracted. E.g., your code will give an answer of 11 for 'XI' as well as 'IX' when the latter should be 9.

Best Answer

Related Solutions

MATLAB: Create Legend From Array

MATLAB: How to replace char in array with a double

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