How do I bypass Error (index must be a positive integer or logical)?

I created a script that will give the average of the negative numbers entered by the user. I was attempting to store the entered values into a vector and then get the average of the elements. I get an error when a negative value is entered. How do I enter negative values for the vector?

%This script will ask the user for a negative number %The loop will end when a zero or positve number is entered. %Then the script will out put the average of the negative numbers clc clear x = input('Enter a negative number: '); i = 0; k = 0; xsum = 0; negvec = 0;

while x < 0 fprintf('You entered a %f.\n',x) negvec(1,k) = x; k = k + 1; i = i + 1; x = input('Enter another negative number: \n'); end

fprintf('Thank you, %d negative numbers entered.\n',i) fprintf('The average is %.2f \n\n',mean(negvec))

Answer 1

[Star Strider]

You would get that error when any value is entered.

Change this to start with 1 rather than zero:

k = 1;

[David Hughes]

Thank you I totally missed that the vector would be start at position 0 with k = 0, and there is no position 0. Thanks.

[Star Strider]

My pleasure.

I can almost guarantee you that most of us here have made that same error at one time or another.