Variable isn't showing in the input command (A little square appears instead)

Hey, I'm new in Matlab but have been searching and didn't find anything that solves my question.

I wrote this:

for i=1:NEOx
    VNEOx(i) = input(['Introduzca la Masa Molar del elemento ' i ': ']);
end

But what I am getting in return isn't the variable "i", which should be firstly 1, then 2...etc. Instead I am getting some little squares:

Any idea about what I am doing wrong?

Thank you very much

Answer 1

[Tommy]

Try either

for i=1:NEOx
    VNEOx(i) = input(['Introduzca la Masa Molar del elemento ' num2str(i) ': ']);
end

or

for i=1:NEOx
    VNEOx(i) = input(sprintf('Introduzca la Masa Molar del elemento %d: ', i));
end

[El Vapor]

That worked! Thank you very much!