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 How to level graphs with different scales		  New Topic  Reply to Topic
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dreamingof8a

Germany
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Posted - 06/09/2007 :  09:02:00 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version: 7.5
Operating System: Win XP

Heythere!

I'm somehow stuck with a simple problem: I have a graph; basically a tilted step function and I want to measure the step height. Therefor and for presentation purposes I'd like to level the graph so that the two parallel lines become horizontal and the step vertical. My problem: On the y-axis my range is 0 to 100 whereas on the x-axis it's 0 to 500000. I'm not sure anymore whether I can simply use the "substract straight line" tool to level the graph?? Does this substraction affect the step i.e. can I do that and the y-axis then tells me the correct step height?
If not, what do I have to do in order to get a levelled graph showing me the step height on the y-axis?

Thanks for helping me out of the dark.

Cheers,
Felix

Mike Buess

USA
3037 Posts
Posted - 06/09/2007 :  12:55:06 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Felix,

The Subtract Straight line command works for a sloping step function as long as you select the region on one side of the step as shown in the first figure, which was created by superimposing a slope (and noise) on a step function with height 20. Subtracting (with Subtract Straight Line) the line in front of the step from the entire curve (the line is extrapolated after the step) creates the bottom figure. The step height was measured by a File Exchange addon as dY = 19.779454, which is close to the actual step size (well within the noise).





Mike Buess
Origin WebRing Member
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dreamingof8a

Germany
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Posted - 06/09/2007 :  5:06:02 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks a lot.
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