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how to plot the mean of values from swept data

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Em
Em on 17 Nov 2020
Commented: Em on 18 Jan 2021
Hi everyone,
I have a array of data where I ramped one variable and measured another a number of times. I would like to find the average of the independent variable at each data point in order to plot this. Does anyone have any suggestions on how I could do this?
Cheers!
Em

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Accepted Answer

Cris LaPierre
Cris LaPierre on 17 Nov 2020
Sure. Use groupsummary. Your grouping variable is your dependent variable, your method is 'mean', and your datavar is your independent variable.
Take the results and plot.

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Em
Em on 17 Jan 2021
Thank you.
So I have tried both
G = groupsummary(acetone,[1,2],'mean')
and
statarray = grpstats(acetone,[1,2],'mean')
statarray1=table2array(statarray)
plot(statarray1(1,:),statarray1(2,:)
To get this data I've changed the variable in column 1 and recorded column 2 a number of times. I want to find the average column 2 value between each time I applied the column 1 variable.
With G and statarray, there are several column 1 values repeated - so it goes between -20 and 20, and there are a few dozen of each column 1 value, really I just want one average value for each column 1 value.
But also below 4 there are no column 1 values at all. I'm not sure what could be happening here.
Thank you for your help with this and sorry if I'm just not understanding something simple.
Cris LaPierre
Cris LaPierre on 18 Jan 2021
Ok, values in the first column of G are duplicated because the grouping is by e07 then VarName1. It is the unique combinations of these 2 variables that creates a group. For example
e07 VarName1
_________ ________
-9.17e-07 -19.4
-9.17e-07 -14.2
It sounds like perhaps you just want to group by VarName1? The just do
G = groupsummary(acetone,"VarName1","mean")
Em
Em on 18 Jan 2021
This is exactly what I was looking for, thank you!

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