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 Derivative Plot not working		  New Topic  Reply to Topic
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DaLuan

United Kingdom
2 Posts
Posted - 01/04/2019 :  1:11:01 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. pro 2016 and 2018b (from university)
Operating System:Windows 10

hello,

I have data for the scattering length density (SLD) from some x-ray reflectivity experiments and the SLD plots just fine, but when I try to plot the derivative of this graph (by Analysis->Mathematics->Differentiate (1st order)), the result is entirely blank. Back in the worksheet, the new column created starts with a zero for the first value and fills in the remaining cells with " -- "
I have also tried doing it directly from the worksheet, and using the differentiate gadget on the graph. The result is the same. I have attached an image illustrating the problem.

I have managed this before with other datasets so I don't know what is wrong with this one.
Can anyone explain what might be wrong / how I can plot the derivative of the SLD data?

Thank you very much
Edited by - DaLuan on 01/04/2019 1:11:55 PM

YimingChen

1609 Posts
Posted - 01/04/2019 :  2:10:48 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

This is because your x column contains duplicated values. To remove duplicates, please use menu Worksheet: Remove/Combine Duplicated Rows....

Thank you
James
Edited by - YimingChen on 01/04/2019 2:11:03 PM
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DaLuan

United Kingdom
2 Posts
Posted - 01/05/2019 :  07:16:34 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by YimingChen

Hi,

This is because your x column contains duplicated values. To remove duplicates, please use menu Worksheet: Remove/Combine Duplicated Rows....

Thank you
James


Thank you so much! ^_^
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