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Lilienstein
3 Posts |
 Posted - 01/18/2016 : 5:40:57 PM
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Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
Hi there!
I would like to plot a function containing the data in a column. I mean the function should be the sum of the data in two different columns, while one of the column is multiplied with x. I can't figure out how to do this with Origin, it must be possible right? I also can't figure out how to determine the minimum of a plotted function.
It would be great if someone can help me :)
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JacquelineHe
287 Posts |
Posted - 01/19/2016 : 05:43:52 AM
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Hi Lilienstein,
I am afraid that I am not sure which kind of the graph you want to create.
Do you want to create a 2D function plot?
http://www.originlab.com/doc/Origin-Help/PD-Dialog-2DFunc-Tab
Or you just want to plot a 2D graph with a column, and this columns value from other two columns?
For example,
In a graph, Column A is X, and column D is Y. And calculate the values Column D= Column B*Column A + Column C. Then you plot the dataset in Column D
If so, you can use set "Set Column Value" tool to get the value for ColumnD.
And if you want to get the minimun value of in a 2D plot, you can try to use the Statistics Gadget:
http://www.originlab.com/doc/Origin-Help/Gadget-Statistics
Thanks
Jacqueline
OriginLab |
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Lilienstein
3 Posts |
Posted - 01/19/2016 : 5:19:12 PM
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Thank you very much for your help!
The Minimum calculation worked well, although I don't know the Position of the Minimum, just it's value.
The function f(x) I want to plot is as following: I have two data sets N_i and t_i with 256 values each. I now have to plot the f(x) that is the sum (from 1 to 256) of N_i*e^((t_i+a)/x)). x is not a data set, just a continuous variable. I tried to use the sum function but it always says that I cant exert such math functions on the columns..
Thanks! :) |
Edited by - Lilienstein on 01/19/2016 5:23:21 PM |
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snowli
USA
1386 Posts |
Posted - 01/19/2016 : 5:41:56 PM
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Hi Lilienstein,
You can add a new column in worksheet next to your two columns N_i and t_i.
Highlight the column and Ctrl+Q to open Set Column Values dialog.
Enter some formula with syntax like this
I suppose e is exponents.
Not sure what x is. You said continous variable. I just set a =2; x=3 in Before Formula Script
Thanks, Snow |
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snowli
USA
1386 Posts |
Posted - 01/19/2016 : 6:02:27 PM
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Also with graph active, you can choose Analysis: Statistics: Discriptive statistics.
On Quantities tab, under Quantiles, you can check Index of Minimum and Index of Maximum to find the row numbers for the min and max. Then find the corresponding X values. Will this work?
Thanks, Snow |
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Lilienstein
3 Posts |
Posted - 01/21/2016 : 12:12:23 PM
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Hey Snow,
Thank you for your help. I now have the Minimum calculation :)
Your post is almost the right direction. I want to plot:
(So I somehow have to do what you said for all possible x-Values (between one and three) and it is also not only that I have in one row, I also need the sum for of the expression for every x...)
Thank you so much!
Cheers Sandra |
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function with data