Array indices must be positive integers or logical values.

gcoord

0 0

0 0

0 0

0 0

.........

Array indices must be positive integers or logical values.

this error is coming please help

Answer 1

[Steven Lord]

Usually this happens when you try to use 0 as an index. Indices in MATLAB start at 1 not 0.

x = 1:10;

This will work:

y(1:2:20) = x.^2

y = 1×19

1 0 4 0 9 0 16 0 25 0 36 0 49 0 64 0 81 0 100

This won't. I've wrapped it in try and catch so code later in this answer can run.

try
    z(0:2:19) = x.^2
catch ME
    fprintf("This code threw error: %s\n", ME.message)
end

This code threw error: Array indices must be positive integers or logical values.

To fix this error, use indices that start at 1 not 0.

Alternately you could be trying to call a function but there's a variable by that name instead. In this case rename the variable so it doesn't have the same name as the function.

q = sin(pi)

q = 1.2246e-16

sin = 42;
w = sin(pi)

Array indices must be positive integers or logical values.

'sin' appears to be both a function and a variable. If this is unintentional, use 'clear sin' to remove the variable 'sin' from the workspace.

If you need further help you will need to show us a small sample of code with which you can reproduce this error.