Array Error Must be Positive

I keep getting an error for the array. I'm not sure what is wrong

Answer 1

[David K.]

If you read the whole error message you see this :

Array indices must be positive integers or logical values.

This is caused by the values of t in:

y(t) = ...

The issue in this case is not that they are not positive. It is that they are not integers.

This is actually solved very simply as such:

t = 0:.1:5;
b = [2;4.7;9.2;]
y = 1-exp(-b*t)

[Walter Roberson]

The explanation is at https://www.mathworks.com/matlabcentral/answers/395816-why-do-i-get-array-indices-must-be-positive-integers-or-logical-values-error-when-using-angle-fu?s_tid=srchtitle#comment_882605