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 How to scale different data sets to same axis?		  New Topic  Reply to Topic
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ulfhinze

Germany
Posts
Posted - 06/29/2005 :  03:27:30 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,

I need to multiply two graphs (datasets), which do not have the same increment in the x-axis. How can that be done in Origin?

Example:
Worksheet 1:
X1; Y1
1; 1
2; 4
3; 9
4; 16
5; 25

Worksheet 2:
X2; Y2
1.0; 5
1.6; 4
2.2; 3
2.8; 4
3.4; 5
4.0; 6
4.6; 5
5.2; 4

How can I multiply these graphs and get x -> y1(x)*y2(x)

Using a simple linear interpolation for the example above the result would be:
X; Y1*Y2
1; 5
2; 13.3
3; 39
4; 96
5; 108.3

Somehow I have to rescale the worksheets to the same x-increment and multiply the interpolated y-data then. But how can that rescaling be done in Origin?

Origin Version: 6.1
Operating System: W2k

Regards,
ulf

ulfhinze

Germany
Posts
Posted - 06/29/2005 :  05:28:22 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

I just solved the problem myself:

1. Plot the dataset as a graph.
2. Use Analysis/Interpolate to create an interpolated graph with an appropriate stepsize.
3. Use the dataset generated for this graph.

That's it. It's just in the wrong menu...

Regards,
Ulf
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Mike Buess

USA
3037 Posts
Posted - 06/29/2005 :  12:04:01 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Ulf,

Analysis > Simple Math interpolates automatically. It overwrites the first dataset so make a copy if you need it.

Mike Buess
Origin WebRing Member
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