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When using the GUI, dates and text do not work as "simple" as with numbers.

One would think that there should be a direct correspondence with the implementation of the GUI, but this is obviously not the case.

However it is presented under the "Commands and API" section. In the current manual it says (page 29) that the "FilterDatasets" command "works on 1D numeric, date or text datasets.". If there is a bit more documentation or advice somewhere, I would very much appreciate it. It looks like Veusz can do exactly what I need, but pretty clearly there's something I don't get. However, all I got were syntax error messages. I tried using both examples 1 and 2, following the links, which seemed very clear and easy to understand. This creates two new datasets which you can than plot or process otherwise: Creating two new datasets: A_filtered and B_filtered B>1 and choose the correct datasets to filter. The other way is to create a filter, using Data > Filter - you can give an expression, i.e. Of course I have to do the same for x, otherwise the correlation is false: Using boolean expression as graph input What I did was ydata=B to filter against values greater than 1. I have two datasets with A=1:10:0.1 and B=sin(A)+1. If you only want to filter for plotting you can do exactly what you were describing: using a boolean expression as filter when defining x and y data. "Reddit gave me a hard time posting images. Reddit post by Kaugummiheld in answer to a post "Veusz approach/alternative to boolean indexing?" Well, I sort of found my answer, but it doesn't seem to work: To put it another way, I commonly don't know exactly what I need to plot beforehand. It often takes a lot of comparison of different things in different ways before I can figure out what that data are showing. I should mention that the reason that I would like to filter data sets like this is that I work with rock and water geochemical data, which is very messy. I've read through on-line help and manual documents, and a lot of these Reddits, which have a lot of great material, but not quite what I'm looking for. Maybe there's a way to do the same thing in the data set editor. I've noticed there are ways to show different colors for data points, so there might be a way to make points invisible if they don't match the criteria. I've tried the Filter Data tool (funnel-shaped icon), but I'm not sure if that's the right tool, and in any case I haven't been able to figure out the expression syntax. In Veusz, as I understand it, I would add three XY widgets, but I haven't figured out how to plot only one type for each widget. In Coplot, a subset of each data set can be made using Plot-If-True Boolean expressions, like this: col(1)=1, which is read: If column 1 (Type) equals 1, plot the data point. color.What I would like to do is plot the 3 samples of each different Type using different colors and symbols, such as Type 1 as black squares, Type 2 as red circles, and Type 3 as blue triangles. #try and do something to some property of an attribute. This works, but def AddPlot(handle,xval,yval): Xy1 = graph.Add('xy',xData = xval, yData = yval) # many of these can be opened at any time VszPlot looks like this: def VszPlot(xval,yval): I then want to have a second function AddPlot(x,y) which will add the new data to the same embedded plot. VszPlot(x,y) should create an initial plot on an embedded window of the lists x against y. Hi I'm trying to put together some functions to perform common tasks using Veusz' object oriented command line ( ).