How to insert a new row on top of the matrix with a different label and insert a new column at the end with the same label

Hello everyone,

I need to create a new row on top of the 132x500 matrix that labeled with C1:C500 and then, a new column at the end that store the same value which is 'Type A' for the whole 132 data. I did use sym function however it gives a lot of burden to my Matlab until it stops multiple time. Thanks in advanced.

    sample = rand(132,500);
   labelRow = sym('c', [1 500]);
   ResultLabelRow= [labelRow;sample];

Answer 1

[Walter Roberson]

Numeric arrays and sym() do not support labels.

The labels you want happen to be acceptable as variable names for a table() object, and they happen to be sequentially numbered in a way that happens to work out, so you could do

C = sample;                     %magic variable name to make the table work columns work out
ResultRowLabel = array2table(C);

If C does not happen to be available as a variable name to store the data in temporarily, then for R2016b or later,

labelRow = cellstr( string('C') + (1:size(sample,2)) );
ResultRowLabel = array2table(sample, 'VariableNames', labelRow);

For earlier versions,

labelRow = cellstr( num2str((1:size(sample,2)).', 'C%d') );

If you do not wish to use a table, then you will need to go into cell arrays,

    labelRow = cellstr( string('C') + (1:size(sample,2)) ) .';
    ResultRowLabel = [labelRow; num2cell(sample)];