I'm making an RRDgraph and I'd like to have a stacked area from a fixed amount of pixels (in fact I have an invisible area with a fixed size stack area on top wich gives me a kind of figure with blocks). The problem is that I'm using the same script for different kind of RRDs and the range of the values is of a completely different magnitude. Now as far as I know you can't give a fixed amount of pixels, only a fixed value, but of course if I have a fixed size of eg. 10, the size of the blocks will be totally different in a graph with values around 1000 compared to a graph with values around 10. So then my idea was to use the min and max values of the Y axis and use this in a CDEF or VDEF calculation (maxY-minY/50 will result in the same size for any kind of RRD). A long explanation to finally come to my question: is it possible to use the min and max Y axis values in a CDEF? and if so, how?
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