Solution to Mathscript Error 90011

[jhauck1]

Hi,

I am working with "Hands-On Introduction to LabVIEW For Scientists and Engineers" by John Essick.  I am stuck on the "do it yourself" problem at the end of chapter 3.  Everytime I go to execute the program I get this message:

Error -90011 occurred at Error in function * at line 7:  The sizes of the input matrices are incompatible.  Verify that the matrices have the same size or that one is a scalar. Possible reason(s): LabVIEW:  The sizes of the input matrices are incompatible.  Verify that the matrices have the same size or that one is a scalar.

This is the code I have entered:

delta_t=1/f_s
start=0
step=delta_t
stop=(N-1)*delta_t
t=start:step:stop

x=A*(1+sin(2*pi*mf*t))*sin(2*pi*sf*t)

And I have attached the VI (when executing, the book says to take N=500, f_s=10000, sf=500, mf=50, and A=1)

Any ideas?

[jhauck1 · Accepted solution]

So it took me about an hour, but right after I posted it on here, I figured it out.  I needed to replace "*" with ".*" for element-wise multiplication.

[HTM88]

Good job.

What is the difference between * and. *? 

[GerdW]

Hi HTM,

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@HTM88 wrote:

What is the difference between * and. *? 

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You can read message #2 of this old thread or the LabVIEW help…