QPlot: ecoplot

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ecoplot

Economically plot large datasets

Call signature:

ecoplot(x0, dx, yy, N=100)

Help text:

ecoplot(x0, dx, yy, n) plots the data (xx,yy) using SAMPLEMINMAX to reduce data length to the given number of points.

The results are plotted as a fill.

X-coordinates are implied to be [x0, x0+dx, x0+2*dx, ...], along yy.

If n is omitted, it defaults to 100.

Note: This is the kind of plot that MEABench calls "TrueBlue".

Example:

import qplot as qp

import numpy as np

qp.figure('ecoplot', 3, 3)

N = 1000000

tt = np.arange(N)

yy = (np.mod(tt, 100000)==30000).astype(float) \

- (np.mod(tt, 130000)==45000).astype(float) \

+ np.random.randn(N)/15

qp.pen('k', 0)

qp.brush('k')

# Plot at 300 dpi but don't lose any spikes

qp.ecoplot(tt[0], tt[1]-tt[0], yy, 3*300)

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