PlotXY does not not for tables including NaNs

Hello

work on this issue (as usual), I was using the PlotXY command for debugging, as follows:

plot_handle = PlotXY (panel_handle, PANEL_GRAPH, x, y_l, 1001, VAL_DOUBLE, VAL_DOUBLE, VAL_THIN_LINE, VAL_NO_POINT, VAL_SOLID, 1, VAL_RED);

Nothing spectacular, in addition to the fact that the plot shows only zeros if the table includes NaNs.

It's (at least) a feature without papers...

If the data table consists of say 100 NaNs and 900 valid numbers, the function to show 900 valid numbers, I would have expected. Also, we could assume a mistake, but the function returns a valid handle plot.

Not there at - it no the ability to display valid numbers?

Thank you

Wolfgang

Wolfgang,

The expected behavior is that the valid points are drawn and the NaNs are ignored. But note that, if you choose a line plot, you must have at least two consecutive points of valid, otherwise you won't see any line segment at all. You could get a better view if you use VAL_CONNECTED_POINTS or VAL_SCATTER.

In addition, NaNs don't contribute to the new limits of the axis, if your axles are autoscaled. Your range of the x-axis appears to be (-10,0.8). If it is autoscaled, what could be the extent of your data x, given that valid points? And everything that you are valid values are 0? Note that NaNs should simply be ignored - they must not become 0. Therefore, a flat line of zeroes is certainly unexpected.

In addition, since it is an XY plot, all it takes is for one of the two values to a given index to be a NaN value for all of the point to be ignored.

Luis

Tags: NI Software

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