i am looking to visualize the positions of two arrays with each other. My Table looks like this
Number Description value_1 value_2 err_1 err_2 1 descript_1 124.46 124.46 22.55 54.2 2 Descript_2 8.20 50.2 0.37 0.1 3 Descript_2 52.55 78.3 3.77 2.41 4 Descript_2 4.33 778.8 0.14 1.78
what i basically want is something like this:
So in this plot every point has basically three properties: 1. xerror bar 2. yerror bar 3. description what this point represents.
I have a feeling that this can be done elegantly with matplotlib, and while i tried some stuff with errorbars that did not quite give me what i would expect. And i have not yet found out how to place the captions in a plot.
It sounds like you want something like this?
import matplotlib.pyplot as plt x = [124.46, 8.20, 52.55, 4.33] y = [124.46, 50.2, 78.3, 778.8] xerr = [54.2, 0.1, 2.41, 1.78] yerr = [22.55, 0.37, 3.77, 0.14] descrip = ['Atom 1', 'Atom 2', 'Atom 3', 'Atom 4'] plt.errorbar(x, y, xerr, yerr, capsize=0, ls='none', color='black', elinewidth=2) for xpos, ypos, name in zip(x, y, descrip): plt.annotate(name, (xpos, ypos), xytext=(8, 8), va='bottom', textcoords='offset points') plt.show()
errorbar works just like
plot. If you want a "scatter" plot then you need to specify
linestyle='none' (or equivalently,
ls='none'). Based on your drawing, you don't want caps on the errorbars, so I've specified
capsize=0. Similarly, you seem to want fairly thick lines for the errorbars, thus
If you want a marker in addition to the errorbars, just specify
marker='o' (or any marker style you'd like) to
annotate is the easiest way to annotate points on a plot. Here, I've specified that the annotation should be placed 8 points above and to the right of each measurement.
import matplotlib.pyplot as plt x = [100, 200, 300, 400] y = [100, 200, 300, 400] xerr = [100, 100, 100, 100] yerr = [20, 20, 20, 20] plt.errorbar(x, y, xerr, yerr, ls='none') plt.show()
mean the error bars are on the wrong axes?
matplotlib.pyplot.errorbar(x, y, yerr=None, xerr=None, fmt=u'', ecolor=None, elinewidth=None, capsize=3, barsabove=False, lolims=False, uplims=False, xlolims=False, xuplims=False, errorevery=1, capthick=None, hold=None, **kwargs)
Note that yerr precedes xerr, so
plt.errorbar(x, y, xerr, yerr, ls='none')
makes your error bars be backwards - yerr=xerr, xerr=yerr. A good time to use named args:
plt.errorbar(x, y, xerr=xerr, yerr=yerr, ls='none')