combining string and numerical values

Within my conditional analysis of a program I'm working on that basically evaluates partial derivatives to give characteristics of a function, I'm trying to combine a string 'a numerical example is' with a chosen number from an array (example(k)). I've tried a few different methods and I believe I need to utilize num2str but when I try to use it, I get back the error "Input to num2str must be numeric." which doesn't make sense because my value is in fact a number?

Just for trouble shooting purpose I tried int2string and was able to get a number but obviously I need the full number, not just an integer.

for k = 1:numel(B)
    if (A(k))>0 
        if(B(k))<0
        disp(['f(x,y) has a saddlepoint at' num2str(x_crit(k)) ]) 
        end
    end    
end

If it helps these are the values I'm trying to call into the string. Thanks in advance for the help!

x_crit =

        0
   -13/10
    13/10
        0
        0
   -13/20
    13/20
   -13/20
    13/20

Answer 1

[KSSV]

doc fprintf ..

fprintf('f(x,y) has a saddlepoint at %f\n', x_crit(k))

[Andrew Waller]

perfect, thanks!