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piermorel / gramm

Gramm is a complete data visualization toolbox for Matlab. It provides an easy to use and high-level interface to produce publication-quality plots of complex data with varied statistical visualizations. Gramm is inspired by R's ggplot2 library.
MIT License
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Error in Subset Selection #51

Closed jotruebl closed 7 years ago

jotruebl commented 7 years ago

Hi. I'm not sure if I'm doing this wrong or if it's a bug (probably the former).

I am trying to choose multiple subsets:

g=gramm('y', allData.ExcelExp_Short_ID12.intensities, 'x', allData.ExcelExp_Short_ID12.chemicalSpecies, 'color', allData.ExcelExp_Short_ID12.sampleName,'subset',allData.ExcelExp_Short_ID12.sampleNum <9 & allData.ExcelExp_Short_ID12.sampleNum >3 & allData.ExcelExp_Short_ID12.chemicalSpecies =="Propenal" & allData.ExcelExp_Short_ID12.chemicalSpecies =="PFBHA")

As you can see, I want to plot sample numbers between 3 and 9 and only the data from Propenal and PFBHA. If I choose to only plot "Propenal" it works fine. But when I add PFBHA as a second x category, I get the following error:

Error using cellfun Input #2 expected to be a cell array, was double instead.

Can you assist with this? Perhaps even an explanation of the syntax for subset selection?

Thanks in advance!

piermorel commented 7 years ago

In that particular example you might want to use | instead of &, as you end up with an empty susbet here (chemicalSpecies can't be Propenal and PFBHA at the same time!). Still I make an internal note of maybe catching that type of error to warn the user that they have an empty subset.

jotruebl commented 7 years ago

Thanks for the rapid response!

I actually tried | earlier and it didn't seem to work:

g=gramm('y', allData.ExcelExp_Short_ID12.intensities, 'x', allData.ExcelExp_Short_ID12.chemicalSpecies, 'color', allData.ExcelExp_Short_ID12.sampleName,'subset',allData.ExcelExp_Short_ID12.sampleNum <9 | allData.ExcelExp_Short_ID12.sampleNum >3 )

The result was that it simply ignored the subset indicator and plotted everything.

piermorel commented 7 years ago

You need to understand how these type of boolean operators work with each other and how logical arrays in Matlab work (not a gramm problem anymore ;) )... For your example you want samplenum>3 AND samplenum <9 AND (species == Propenal OR species == PFBHA)

jotruebl commented 7 years ago

Ah okay. I'll read up on it. Thanks again for your guidance. :)

Edit: Your hint helped me out a ton. I got it to work. Thanks again!