How can I call Fourier Analysis from a Visual Basic macro?


G

Guest

I recorded a macro in Excel that included using the Fourier Analysis tool
from the VBA Analysis ToolPak, but when I ran the macro, I got an error
saying the input range was not defined. When I recorded the macro, I had
entered an input range, so I examined the macro code. I didn't see my input
range in the code, but I realised I didn't know how the Fourier Analysis
application had to be called from Visual Basic anyway.

The macro recorder had inserted the line:
Application.Run "ATPVBAEN.XLA!Fourier", , , False, False
for forward Fourier transformation, and
Application.Run "ATPVBAEN.XLA!Fourier", , , True, False
for inverse Fourier transformaiton.

Can anyone who has used the Fourier Analysis tool from Visual Basic help me
by describing the syntax for calling Fourier Analysis (ATPVBAEN.XLA!Fourier)?

Many thanks.
 
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D

Dave Peterson

It looks like it goes in this order:
input_Range,output_range,inverse,labels_in_first_row

When I recorded a macro and selected a couple of ranges, I got:

Application.Run "ATPVBAEN.XLA!Fourier", ActiveSheet.Range("$A$1:$A$8"), _
ActiveSheet.Range("$B$1:$F$7"), False, False
 
G

Guest

Thanks, Dave. That worked. In fact, I tried putting Range(...) into the two
spaces in the calling line, but the syntax I used wasn't what you put in your
reply, so it seems to matter how Range is used.
 
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D

Dana DeLouis

Also note that the Fourier program only looks at the upper left corner of
the output range address.

Sub SmallDemo()
Const FFT As String = "ATPVBAEN.XLA!Fourier"
Const Forward As Boolean = False

Run FFT, [A1:A8], [B1], Forward
End Sub

:>)
 

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