how to display the all intervals in colorbar using matplotlib

Question

This is my code.I mentioned here 50 intervals,when i drag the slider then only i got 6 or 7 intervals,but i want to display the all my intervals in my colorbar. So can any one please guide me.Thank you in advance.

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider, Button
import matplotlib.colors
ax = plt.subplot(111)
plt.subplots_adjust(left=0.25, bottom=0.25)
img_data = np.random.rand(50,50)

c_max = 2
img = ax.imshow(img_data, interpolation='nearest')
cb = plt.colorbar(img)
axcolor = 'lightgoldenrodyellow'
ax_cmax  = plt.axes([0.25, 0.15, 0.65, 0.03])
s_cmax = Slider(ax_cmax, 'max', 0, 50, valfmt=c_max)
def update(val, s=None):
    # _cmin = s_cmin.val
    _cmax = s_cmax.val
    img.set_clim(_cmax)
    plt.draw()
s_cmax.on_changed(update)

plt.show()

DavidG · Accepted Answer · 2018-10-30 11:23:16Z

2

The argument to Slider called valfmt should be a string which is used to format the slider value.

So if you wanted to display 2 decimal places to the float you would need to make c_max = "%1.2f". Note that if you want to keep the minimum value at 0 you need to set that too in img.set_clim(0, _cmax)

c_max = "%1.2f"
img = ax.imshow(img_data, interpolation='nearest')
cb = plt.colorbar(img)
axcolor = 'lightgoldenrodyellow'
ax_cmax  = plt.axes([0.25, 0.15, 0.65, 0.03])
s_cmax = Slider(ax_cmax, 'max', 0, 50, valfmt=c_max)
def update(val, s=None):
    # _cmin = s_cmin.val
    _cmax = s_cmax.val
    img.set_clim(0, _cmax) 
    plt.draw()
s_cmax.on_changed(update)

plt.show()

edited Oct 30, 2018 at 11:23

answered Oct 30, 2018 at 11:13

DavidG

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9 Comments

navya sri Over a year ago

thank you somuch for you answer,but sir i want to showed to all intervals here i mentioned 50

DavidG Over a year ago

I don't understand what you mean by all intervals. Can you exlain in more detail?

navya sri Over a year ago

when i drag the slider then only my remaning intervals are coming but i want to display the whole intervals in colorbar i.e the problem

navya sri Over a year ago

yes here s_cmax = Slider(ax_cmax, 'max', 0, 50, valfmt=c_max) here i took 0 to 50 values those values i want to display in colorbar sir

DavidG Over a year ago

What should the slider do then, if not to adjust the values on the colorbar (and hence the image)?

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