how to solve this error

Array indices must be positive integers or logical values.

clear all

clc

n = [-5:5];

h = [1 0 2 0 3 0 0 0 0 0 0];

y = 3 * h(-n-3);

stem(n,y)

[Dyuman Joshi]

The error is clear - Indices in MATLAB can not be negative or non-integeral values.

They must be postivie integers or logical values (as the error states).

You are using (-n-3) as indices which has negative values.

Also, h is mapped for [-5 5], whereas (-n-3) ranges from [-8 2]. What should be the values when n is -8, -7, or -6?

Answer 1

[Arun]

Hey Brito,

The variable 'h' has index values ranging from 1 to 11. To obtain the desired results, you may consider modifying the code as shown in the following snippet.

n = [-5:5];
h = [1 0 2 0 3 0 0 0 0 0 0];
y = 3 * h(-(-n-3-3));   % or y = 3 * h(n+6);
y

y = 1×11

3 0 6 0 9 0 0 0 0 0 0

stem(n,y)

Hope this helps.