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 Calculate / Plot weight loss per minute

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Simon90 Posted - 09/02/2015 : 03:40:28 AM
Hi there,

sorry headline is not perfect, but I change it when I know more about the problem.

I have a table with time, temperature and weight and I need to plot the weight loss per minute. Can someone please tell me how to do this?
It is a TG-Analysis by the way



Origin Ver. and Service Release (Select Help-->About Origin): 9.0 SR1
Operating System: Windows 7 Pro 64bit
3   L A T E S T    R E P L I E S    (Newest First)
SeanMao Posted - 09/05/2015 : 9:12:39 PM
Hi,

I tried with the 13 data points you have provided, the X axis is normally shown.





To convert to minutes in Origin 9.0, you can insert a new column and use formula to convert seconds to minutes by dividing column A by 60 and then set newly added column as X to calculate the 1st derivative.

In version later than Origin 9.0, there is a custom formula option to allow you easily customize the axis label by a custom formula.

Would you mind sending your data over tech@originlab.com to let me diagnose it on my side?

Regards!

Sean
Simon90 Posted - 09/02/2015 : 12:38:25 PM
quote:
Originally posted by SeanMao

Hi,

If you are looking for weight change rate vs time, you can calculate the 1st derivative of Weight vs Time and convert the scale to minute.
To calculate 1st derivative, highlight column weight and go to menu Analysis: Mathematics: Differentiate to open dialog. Check "Plot Derivative Curve" box if you want to plot it.




Hi Sean,

thank you very much for the quick reply. It tried that too, but it seems not correct to me.
There is only data from 1 to 60, though the original x-axis is from 1 to 2,5E6.
And is there a way to scale from milliseconds to seconds or minutes? I dont know how to change the format of the x-axis. Thanks for help!
SeanMao Posted - 09/02/2015 : 05:43:42 AM
Hi,

If you are looking for weight change rate vs time, you can calculate the 1st derivative of Weight vs Time and convert the scale to minute.
To calculate 1st derivative, highlight column weight and go to menu Analysis: Mathematics: Differentiate to open dialog. Check "Plot Derivative Curve" box if you want to plot it.

If this is not what you meant to do, please proceed with more details.

Regards!

Sean

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