How to remove this error??

Here is my code

function [] = plot_rho()
h= zeros(80,1);
h(1,1)=1000;
density = zeros(80,1);
k=1;
while k<=80;
   density(k,1) = rho(h(k,1));
   h(k+1,1)= h(k,1)-10;
   k=k+1;
end
plot(density,h);
grid on;

getting an error like this but I have defined density and h of same length 80 so why this error

Error using ==> plot

Vectors must be the same lengths.

Error in ==> plot_rho at 11
plot(density,h);

Answer 1

[kjetil87]

You are indexing h as

h(k+1,1)

That way when k=80 you are assigning a new value to

h(81)=h(80,1)-10;

And thus the size of h grows to 81.

Answer 2

[Image Analyst]

h is 81 long while density is still only 80 long. This could be easily figured out if you know how to debug programs. See this: http://blogs.mathworks.com/videos/category/gui-or-guide/ Then you will also see that your code won't even run because you didn't define rho. You never would have gotten that error with the code that you posted. So that's how I know that you are not posting the actual code you are running.