MATLAB: How can i display a vector as a result of a for loop

for loop

I have thi loop for and i want to display the mmk but i can't for rload=0:20:50000 v = -x(:,3)*rload; mn =(max(v)-min(v))/2 mk=mn'; end

Index the variables and leave off the semicolon

for rload=0:20:50000
    v = -x(:,3)*rload;
    mn =(max(v)-min(v))/2 % A single number.
    mk(rload) = mn
end

ii=0:200:50000;
n = numel(ii);
mn = zeros(n,1);
for jj = 1:n
    v = -ii(jj).*x(:,3); 
    mn(jj) = (max(v)-min(v))./2 ;
end

or without for..end loop

v = x(:,3)*(0:200:50000);
mn = (max(v) - min(v))/2;

Your code has

for rload=0:20:50000

but you do not use the value of rload anywhere in your code.

Note: that loop could be replaced by just

fk = abs(x(:,1));