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*nala*29

Germany
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Posted - 05/11/2008 :  06:55:16 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello!
Could somebody explain me how I make a logarthim fit in origin 7.5? The problem is that the scale of the x-acsis is logarithmic and I have to make a fit which has to appear as a straight line, which has to intersect the x-axis too. Please give simple directions cause I'm not a computer expert.

greg

USA
1379 Posts
Posted - 05/14/2008 :  2:30:57 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I don't know what a logarithmic fit is, but it sounds like what you want is a fit that appears linear when your X axis is logarithmic.

Select Tools : Linear Fit from your menu
Click the Settings tab and check the 'Apparent Fit' checkbox
Back on the Operation tab click the Fit button

This should give you a straight line fit of your data. It isn't a straight line as you will see if you change the X Axis scale back to Linear.
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*nala*29

Germany
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Posted - 05/18/2008 :  05:27:32 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks a lot,
that's what i was looking for!
you're my hero ;)
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