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T O P I C    R E V I E W
khaljasem Posted - 11/16/2004 : 12:04:22 PM
Origin Version (Select Help-->About Origin):Origin 7.5 Demo
Operating System:Windows XP.
Hallo Every body,
I am a new Originlab user. I would like to plot in 2D (f(x,y))the difference between two garaphs which their data are given in two tables which the first and last points in the intervals(x values) are equal whereas the middle points are different. It is similar to do interpolation or plotting the error function between numerical and analytical solutions with different midpoints taken inside the interval.
Thanx a lot
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greg Posted - 11/17/2004 : 12:02:56 PM
I'm not sure this answers your question ...

Origin supports interpolation in math operations involving datasets. This means you can do math operations between two datasets that do not share the same X values. The operation will be performed only for the common range of data. This can be done in the GUI using a graph window.

WARNING! The following operation is 'destructive' so work with copies of your data if you need the original.

Copy and Paste this data to a worksheet :

1 2.5 0 -10
2 2 2 0
3 1.5 4 7

Set the C column as X and plot B and D as Line+Symbol

Select Analysis : Simple Math from the menu.

The dialog uses two dataset names and an operator. The first dataset (Y1) is initialized to the active dataset in the graph (Y), but this can be changed. The second dataset (Y2) is the one that will be used to modify the first based on the chosen operator.
Let's leave the Y1 dataset as column B and highlight the D column in Available Data and click the => button next to Y2 to set it as the second dataset. Enter '-' in the operator field and click OK.



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