python - Annotate plot in matplotlib -


i have 3 vectors a, b, , c in numpy.

the vector b computed function of a: b = f(a).

i'm plotting b matplotlib plot(a, b).

the vector c has x-positions. want annotate plot @ x-positions in vector c y-values near values in vector b.

it easy if compute y-value f(c) , plotting @ (x,y) = (c,f(x)) since got vector b computed values, cannot recalculate values values in c.

i've tried

plt.plt(a,b)  x in np.nditer(c):     plt.annotate("text", xy=(x, ?), xytext=(x, ?), arrowprops=dict(facecolor='black', arrowstyle="->"))

but don't know y-coordinate.


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