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How to calculate the abscissa values for the given vertical values [message #68136] Mon, 05 October 2009 01:56
duxiyu@gmail.com is currently offline  duxiyu@gmail.com
Messages: 88
Registered: March 2007
Member
Hi, all.
I want to calculate the abscissa values for the given vertical values.

For example,
x = findgen(1000)/1000*4*pi
y = cos(x)
I want to get the abscissa values for y=0.
For this example, the results shoule be [!pi/2, 3*!pi/2, 5*!pi/2, 7*!
pi/2].
But how can I get it by IDL codes?

Best wishes,
jdu

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