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bug in VELOVECT.PRO [message #7039]

Wed, 11 September 1996 00:00

Joop Schaye
Messages: 1
Registered: September 1996

Junior Member

Hi,

There is a bug in the IDL procedure VELOVECT.PRO (IDL version 4.0.1).
LENGTH=1.0 (the default) does not make the longest (U,V) vector the
length of a cell, as it should.

The following lines contain an error:

x_step=float(x1-x0)/float(s(1)) ; Convert to float. Integer math
y_step=float(y1-y0)/float(s(2)) ; could result in divide by 0

They should be corrected to:

x_step=float(x1-x0)/float(s(1)-1) ; Convert to float. Integer math
y_step=float(y1-y0)/float(s(2)-1) ; could result in divide by 0

The error becomes increasingly important for smaller input vectors U and
V. I have reported the error to Research Systems, Inc.

Best regards,

Joop Schaye

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