Help with for loop for a function

I am trying to run the following for loop for different values of t from 0.01 to about 10 however I keep on getting Attempted to access M(0.1); index must be a positive integer or logical. Error in untitled3 (line 3)

When i change t to be a integer the for loop runs perfectly fine and saves the output into a vector M. I also tried using the cell command but it didn't work. Any help would be appreciated. The function does take any number, it doesn't have to be an integer. When I run the function for specific values it does work.

M=[];

for t=0.01:0.01:10;

M(t)=dtmf_attack(t);

end

display(M)

Answer 1

[Orion]

just add a counter

M=[];

i=0;

for t=0.01:0.01:10;
   i=i+1;
   M(i)=dtmf_attack(t);
end

display(M)

Answer 2

[Image Analyst]

Try this:

% Define t
t=0.01:0.01:10;
% Build M:
M = zeros(1, length(t)); % Optional preallocation.
for k = 1 : length(t)
    M(k) = dtmf_attack(t(k));
end
% Display M
M

Answer 3

[Andrea]

Thanks they both worked