Circular shift?

Posted Thu, 12/11/2008 - 05:36 by mattwood

Hi, Robert et al.:

I'm doing some average light curves from simulations where phase is the x axis. It would be useful to have a circular shift function for the y values so I can put the minimum y value at phase = 0.0, for example. Does SM have such a function, or has anyone written a macro? In f90, it's CSHIFT, and in IDL, it's SHIFT ...

Thanks,
Matt Wood, Professor
Florida Tech Dept Physics & Space Sciences
Melbourne, FL, USA

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vcentre (or vcenter) is the

by rhl - 05/27/2009 - 04:23

vcentre (or vcenter) is the Official answer:

load fourier
set z = vcentre(y)

but now that I look it's not very smart. A better solution is:
set i0 = 50 set z = y[do(i0,dimen(y)-1)] concat y[do(0,i0-1)]
and I should update the macro.

Incidently, there's also vshift, but it doesn't use periodic
boundary conditions.

uh-oh

by Patricia - 05/26/2009 - 20:14

do you still care about this? can you use the vshift macro in the fourier macro file to do what you want? ie

: load fourier
: help vshift

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