'Array indices should be positive' error

Let's say I'm taking an array of values from an Excel file,

maybe the first column in the excel file and I wanna find the standard deviation for it.

So the code is gonna be

col=a(:,1);

std=std(col);

It gives an output for the first run, but when I run it second time, it gives an error saying,"Array indices should be positive". Why?

Kindly help.

Thanks,

Vinisha.

Answer 1

[Star Strider]

This is the reason:

std=std(col);

You ‘overshadowed’ the std function by naming your variable ‘std’.

Do this and the problem will go away:

StDev = std(col);

You will have to change that variable in the rest of your code, however the MATLAB Editor should make that easy.

[Vinisha Venugopal]

It worked. Thank you :)

[Star Strider]

As always, my pleasure!

[Timmy Watt]

This solved my problem too, thank you!

[Star Strider]

My pleasure!