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POcalculating mean of several numpy masked arrays (masked_all)
 

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  1. POcalculating mean of several numpy masked arrays (masked_all)
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    <p>first of all I'm new to python and programming but you guys already helped me a lot, so thanks a lot! But I've come to a problem I haven't found an answer so far:</p> <p>I have the data of several plates where the data represents the pressure on each plate at a large number of different spots. The thing is, these plates aren't perfectly round because of the sensors measuring the pressure and sometimes these sensors even produce an error so I don't have any data at a spot within the plate.</p> <p>When I just have to plot one plate, I'll do it like that:</p> <pre><code>import numpy.ma as ma matrix=ma.masked_all((160,65),float) for x in range(len(plate.X)): matrix[(plate.Y[x],plate.X[x])]=data.index(plate.measurementname[x]) image.pcolormesh(matrix,min,max) </code></pre> <p>This works fine. Now that I have several plates I'd like to plot the mean pressure on each spot. Because I don't know any mean function, I thought of adding all plates together and divide by the number of plates...I tried following:</p> <pre><code>import numpy.ma as ma meanmatrix=ma.masked_all((160,65),float) for plate in plateslist: matrix=ma.masked_all((160,65),float) for x in range(len(plate.X)): matrix[(plate.Y[x],plate.X[x])]=data.index(plate.measurementname[x]) meanmatrix+=matrix meanmatrix=meanmatrix/len(plateslist) image.pcolormesh(meanmatrix,min,max) </code></pre> <p>This works pretty good but there's one problem I can't solve. As I said sometimes some plates didn't get all data, therefore there's a "hole" at some spots in the plot. Now my meanmatrix has a whole where ever one of the plates had a whole even if all others had data at that spot.</p> <p>How can I make sure I won't get these holes or is there even a smoother way of getting my "meanmatrix"?? (I hope my question is clear enough...)</p> <p>Edit:</p> <p>The problem is not that I don't get the mean of the data, this actually works (well I don't like how I did it but it works), the problem is that I get these "holes" I described before. That's what bothers me.</p>
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