converting a vector entry into string

Hello fellows: I know that this topic (conversion of a number into a string) is very basic one and the syntax for it is num2str. However I am facing an error when trying to convert a number in a vector into string using the following for loop:

for i=1:L-1
    display(['k', num2str(i),' = ',num2str(k(i)),' pixels^-1.']);
end

The error is:

Undefined function 'num2srt' for input arguments of type 'double'.

Any help will be appreciated

[Azzi Abdelmalek]

what is k? give us for ewample for i=1 what do you want to get

Answer 1

[Oleg Komarov]

It appears to be a typo, are you sure that you're using num2str() instead of num2srt()?

[Said Rahal]

yes I am sure because I copy the for loop from the code and pasted it in the question directly