array and inverse tan

Question

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Good evening,

The following line of code was working, until I added in the inverse tan that I missed writting in.

Adding the 'atand' is producing an error in this line. I've tried both 'atand' and 'atand.* ' and both ways produce an error.

How can I fix this issue?

Thank you for your assistance!

phata_values = atand.*[phataY./phataX];

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David Goodmanson 2021-1-11

编辑：David Goodmanson 2021-1-11

Hi Jocelyn,

try atand(phataY./phataX). Even better, if you want a four-quadrant version of atan, use atan2d(phataY,phataX)

Answer 1

John D'Errico 2021-1-11

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I think you do not unerstand MATLAB. I'd start with taking the Onramp tutorial. atand of what?

atand is a FUNCTION. You need to pass it arguments. For example, Perhps you intended to write this:

phata_values = atand(phataY./phataX);

Or perhaps you wanted to write

phata_values = atand(z).*(phataY./phataX);

where z is some unknown variable that you never told us about.