python - Major and minor grid lines and ticks using matplotlib -


i have 2 big intergers

min=round(raw_min,-5) # negative number max=round(raw_max,-5)

from range of interesting ticks:

xticks=np.arange(min,max,500000)

on x-axis, want have minor ticks (including labels) xticks range. furthermore, want have major tick , grid line @ value 0. tried add:

minorlocator = fixedlocator(xticks) majorlocator = fixedlocator([0])  ax.xaxis.set_major_locator(majorlocator) ax.xaxis.set_major_formatter(formatstrformatter('%d')) ax.xaxis.set_minor_locator(minorlocator) plt.tick_params(which='both', width=1) plt.tick_params(which='major', length=7, color='b') plt.tick_params(which='minor', length=4, color='r') ax.yaxis.grid(true) ax.xaxis.grid(b=true,which='major', color='b', linestyle='-')

but doesn't work...

enter image description here

no ticks minors , no grid line major.

any ideas?

seems missing following line:

plt.grid(b=true,which='both')

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