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Differentiate - x data does not match y data?

Wed, 07/27/2011 - 05:27 pm

I'm having a bit of an issue here. When I try to use Differentiate with a specified x wave, I keep getting "X data does not match Y data (length or number type)." However, when I check to make sure that the types and lengths are the same, I get

print numpnts(energy), numpnts(t_1_r)

  3255  3255

print numtype(energy(1)), numtype(t_1_r(1))

  0  0

So I'm not sure what the problem could be. The command I'm using is

Differentiate t_1_r/X=Energy/D=t_1_r_dif

aclight

You should use the WaveType() function to make sure that the source and X wave types are the same (or use the Data Browser), not numtype. Your two numtype statements are just telling you that the value in your two waves at x=1 is a normal number, but that doesn't tell you anything about the wave type.

July 28, 2011 at 08:38 am - Permalink

fyzikapan

And that does the trick. I had forgotten a /D when I created t_1_r.

Thanks!

July 28, 2011 at 09:38 am - Permalink