Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
How to calculate the abscissa values for the given vertical values
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