tan function giving an error

x = (-pi/2)+0.01:0.01:(pi/2)-0.01; plot(x,tan(x)), grid on

gives an error: Array indices must be positive integers or logical values. but changing tan to either sin or cos does not give an error. Code above is from MATLAB.

Answer 1

[Star Strider]

Your code works when I run it.

That you are getting the error: ‘Array indices must be positive integers or logical values.’ leads me to believe that you have a variable named ‘tan’ in your workspace. This is called ‘overshadowing’ a function.

To find out, run this from your Command Window or a script:

which tan -all

If the first result is:

tan is a variable.

You have found the problem. You then have to rename the ‘tan’ variable to something meaningful, and so the name does not ‘overshadow’ any MATLAB functions.