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Trig plots auto-shifted (?) [message #84689] Thu, 02 August 2012 18:23
A J is currently offline  A J
Messages: 11
Registered: February 2012
Junior Member
Anyone know why IDL plots trig functions of negative numbers as
shifted to the positive?

Example:

x = -1. * dindgen(100)
y = sin(x)
plot, y, xrange=[-100,100]

plots the correct sine function, but over the xrange of [0,100] even
though the input xvalues are all negative. I know I could shift it
back, but I want to know why it is doing this. Any thoughts?

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