Matplotlib: Increase ax.matshow width/height, and set color map (cmap) to transparent












0















I have a matrix built of random values and I plotted it with ax.matplot, where the value of each matrix cell is plotted in the center of the matrix cell, and I need to increase the size of the plot (specially the width) and also set the color map (cmap) to "transparent", where the cells of the matrix plot will be white and the matrix value in the center of the cell with be black.



The code:



import numpy as np

import matplotlib.pyplot as plt



low_dim = 0

high_dim = 20



matrix = np.random.randint(low_dim, high_dim, (high_dim,high_dim))

print (matrix)

fig, ax = plt.subplots()



ax.matshow(matriz, cmap=None,interpolation='nearest')



for i in xrange(20):

    for j in xrange(20):

        number = matrix[j,i]

        ax.text(i, j, str(number), va='center', ha='center')





plt.show()


EDIT



That's matrix in the code (https://i.stack.imgur.com/e3mGO.png (matrix), a matrix generated with the command matrix = np.random.randint(low_dim, high_dim, (high_dim,high_dim)), the picture is from the console.



I've tried changing the figsize in fig,ax = plt.subplot(),but it doesn't change anything. And I've also set cmap = none but nothing happened.



Another problem is that, in the first picture, the numbers in the index of x and y axes are varying from 0 to 15 and stepping 5, like 0, 5, 10, 15 (I've marked it in red). But in the second picture (also marked in red), the values are from 0 to 19,with no step. If possible, I need to arrive to the second picture's result, the indexes varying from 0 to 19 with no step.



Picture 1: What I'm getting: https://i.stack.imgur.com/mlExQ.png



Picture 2: What I need to get: https://i.stack.imgur.com/T3CC4.png






python-2.7 matplotlib axes colormap







share|improve this question

























  • What is matrix in your code? And if you use Python 2.7, you should tag the question accordingly.

    – Mr. T
    Nov 25 '18 at 18:26











  • I've edited it.

    – L'utilisatrice
    Nov 25 '18 at 18:35











  • I would have hoped, this example to be of help.

    – ImportanceOfBeingErnest
    Nov 25 '18 at 18:41
















0















I have a matrix built of random values and I plotted it with ax.matplot, where the value of each matrix cell is plotted in the center of the matrix cell, and I need to increase the size of the plot (specially the width) and also set the color map (cmap) to "transparent", where the cells of the matrix plot will be white and the matrix value in the center of the cell with be black.



The code:



import numpy as np

import matplotlib.pyplot as plt



low_dim = 0

high_dim = 20



matrix = np.random.randint(low_dim, high_dim, (high_dim,high_dim))

print (matrix)

fig, ax = plt.subplots()



ax.matshow(matriz, cmap=None,interpolation='nearest')



for i in xrange(20):

    for j in xrange(20):

        number = matrix[j,i]

        ax.text(i, j, str(number), va='center', ha='center')





plt.show()


EDIT



That's matrix in the code (https://i.stack.imgur.com/e3mGO.png (matrix), a matrix generated with the command matrix = np.random.randint(low_dim, high_dim, (high_dim,high_dim)), the picture is from the console.



I've tried changing the figsize in fig,ax = plt.subplot(),but it doesn't change anything. And I've also set cmap = none but nothing happened.



Another problem is that, in the first picture, the numbers in the index of x and y axes are varying from 0 to 15 and stepping 5, like 0, 5, 10, 15 (I've marked it in red). But in the second picture (also marked in red), the values are from 0 to 19,with no step. If possible, I need to arrive to the second picture's result, the indexes varying from 0 to 19 with no step.



Picture 1: What I'm getting: https://i.stack.imgur.com/mlExQ.png



Picture 2: What I need to get: https://i.stack.imgur.com/T3CC4.png






python-2.7 matplotlib axes colormap







share|improve this question

























  • What is matrix in your code? And if you use Python 2.7, you should tag the question accordingly.

    – Mr. T
    Nov 25 '18 at 18:26











  • I've edited it.

    – L'utilisatrice
    Nov 25 '18 at 18:35











  • I would have hoped, this example to be of help.

    – ImportanceOfBeingErnest
    Nov 25 '18 at 18:41














0












0








0








I have a matrix built of random values and I plotted it with ax.matplot, where the value of each matrix cell is plotted in the center of the matrix cell, and I need to increase the size of the plot (specially the width) and also set the color map (cmap) to "transparent", where the cells of the matrix plot will be white and the matrix value in the center of the cell with be black.



The code:



import numpy as np

import matplotlib.pyplot as plt



low_dim = 0

high_dim = 20



matrix = np.random.randint(low_dim, high_dim, (high_dim,high_dim))

print (matrix)

fig, ax = plt.subplots()



ax.matshow(matriz, cmap=None,interpolation='nearest')



for i in xrange(20):

    for j in xrange(20):

        number = matrix[j,i]

        ax.text(i, j, str(number), va='center', ha='center')





plt.show()


EDIT



That's matrix in the code (https://i.stack.imgur.com/e3mGO.png (matrix), a matrix generated with the command matrix = np.random.randint(low_dim, high_dim, (high_dim,high_dim)), the picture is from the console.



I've tried changing the figsize in fig,ax = plt.subplot(),but it doesn't change anything. And I've also set cmap = none but nothing happened.



Another problem is that, in the first picture, the numbers in the index of x and y axes are varying from 0 to 15 and stepping 5, like 0, 5, 10, 15 (I've marked it in red). But in the second picture (also marked in red), the values are from 0 to 19,with no step. If possible, I need to arrive to the second picture's result, the indexes varying from 0 to 19 with no step.



Picture 1: What I'm getting: https://i.stack.imgur.com/mlExQ.png



Picture 2: What I need to get: https://i.stack.imgur.com/T3CC4.png






python-2.7 matplotlib axes colormap







share|improve this question
















I have a matrix built of random values and I plotted it with ax.matplot, where the value of each matrix cell is plotted in the center of the matrix cell, and I need to increase the size of the plot (specially the width) and also set the color map (cmap) to "transparent", where the cells of the matrix plot will be white and the matrix value in the center of the cell with be black.



The code:



import numpy as np

import matplotlib.pyplot as plt



low_dim = 0

high_dim = 20



matrix = np.random.randint(low_dim, high_dim, (high_dim,high_dim))

print (matrix)

fig, ax = plt.subplots()



ax.matshow(matriz, cmap=None,interpolation='nearest')



for i in xrange(20):

    for j in xrange(20):

        number = matrix[j,i]

        ax.text(i, j, str(number), va='center', ha='center')





plt.show()


EDIT



That's matrix in the code (https://i.stack.imgur.com/e3mGO.png (matrix), a matrix generated with the command matrix = np.random.randint(low_dim, high_dim, (high_dim,high_dim)), the picture is from the console.



I've tried changing the figsize in fig,ax = plt.subplot(),but it doesn't change anything. And I've also set cmap = none but nothing happened.



Another problem is that, in the first picture, the numbers in the index of x and y axes are varying from 0 to 15 and stepping 5, like 0, 5, 10, 15 (I've marked it in red). But in the second picture (also marked in red), the values are from 0 to 19,with no step. If possible, I need to arrive to the second picture's result, the indexes varying from 0 to 19 with no step.



Picture 1: What I'm getting: https://i.stack.imgur.com/mlExQ.png



Picture 2: What I need to get: https://i.stack.imgur.com/T3CC4.png






python-2.7 matplotlib axes colormap




python-2.7 matplotlib axes colormap






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 25 '18 at 18:34







L'utilisatrice

















asked Nov 25 '18 at 18:12









L'utilisatriceL'utilisatrice

981110




981110













  • What is matrix in your code? And if you use Python 2.7, you should tag the question accordingly.

    – Mr. T
    Nov 25 '18 at 18:26











  • I've edited it.

    – L'utilisatrice
    Nov 25 '18 at 18:35











  • I would have hoped, this example to be of help.

    – ImportanceOfBeingErnest
    Nov 25 '18 at 18:41



















  • What is matrix in your code? And if you use Python 2.7, you should tag the question accordingly.

    – Mr. T
    Nov 25 '18 at 18:26











  • I've edited it.

    – L'utilisatrice
    Nov 25 '18 at 18:35











  • I would have hoped, this example to be of help.

    – ImportanceOfBeingErnest
    Nov 25 '18 at 18:41

















What is matrix in your code? And if you use Python 2.7, you should tag the question accordingly.

– Mr. T
Nov 25 '18 at 18:26





What is matrix in your code? And if you use Python 2.7, you should tag the question accordingly.

– Mr. T
Nov 25 '18 at 18:26













I've edited it.

– L'utilisatrice
Nov 25 '18 at 18:35





I've edited it.

– L'utilisatrice
Nov 25 '18 at 18:35













I would have hoped, this example to be of help.

– ImportanceOfBeingErnest
Nov 25 '18 at 18:41





I would have hoped, this example to be of help.

– ImportanceOfBeingErnest
Nov 25 '18 at 18:41












1 Answer
1






active

oldest

votes


















0














matshow takes arguments for origin and alpha. The rest is just settings ticks and labels.



ax.matshow(matrix, origin='lower', alpha=0, cmap=None, interpolation='nearest')



tick_labels = range(high_dim)

ax.set_xticks(, minor=False)

ax.set_xticks(np.arange(-.5, 20, 1), minor=True)

ax.set_yticks(, minor=False)

ax.set_yticks(np.arange(-.5, 20, 1), minor=True)

ax.set_xticklabels(, minor=False)

ax.set_xticklabels(tick_labels, minor=True)

ax.set_yticklabels(, minor=False)

ax.set_yticklabels(tick_labels, minor=True)

ax.xaxis.set_ticks_position('bottom')

ax.grid(which='minor', color='grey', linestyle='-', linewidth=1)





share|improve this answer
























  • I ran the code and the result was a little problem I faced before and wasn't capable of solving: That's the resulted matrix in the console (I print it first in the console to check if the plot code is fine) ---> i.imgur.com/JpS5ZJF.jpg, and that's the plot generated ---> i.imgur.com/4RRiXU3.jpg. Notice that the lines are "upside down", and so are the index of y axis (19 at top, 0 at bottom). How could I soulve that?

    – L'utilisatrice
    Nov 26 '18 at 1:18













  • If you want to have your origin in the upper left corner, you can set origin='upper'

    – pxe
    Nov 26 '18 at 1:28











  • Thank you so much! It's working now.

    – L'utilisatrice
    Nov 26 '18 at 11:58











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1 Answer
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active

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1 Answer
1






active

oldest

votes









active

oldest

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active

oldest

votes









0














matshow takes arguments for origin and alpha. The rest is just settings ticks and labels.



ax.matshow(matrix, origin='lower', alpha=0, cmap=None, interpolation='nearest')



tick_labels = range(high_dim)

ax.set_xticks(, minor=False)

ax.set_xticks(np.arange(-.5, 20, 1), minor=True)

ax.set_yticks(, minor=False)

ax.set_yticks(np.arange(-.5, 20, 1), minor=True)

ax.set_xticklabels(, minor=False)

ax.set_xticklabels(tick_labels, minor=True)

ax.set_yticklabels(, minor=False)

ax.set_yticklabels(tick_labels, minor=True)

ax.xaxis.set_ticks_position('bottom')

ax.grid(which='minor', color='grey', linestyle='-', linewidth=1)





share|improve this answer
























  • I ran the code and the result was a little problem I faced before and wasn't capable of solving: That's the resulted matrix in the console (I print it first in the console to check if the plot code is fine) ---> i.imgur.com/JpS5ZJF.jpg, and that's the plot generated ---> i.imgur.com/4RRiXU3.jpg. Notice that the lines are "upside down", and so are the index of y axis (19 at top, 0 at bottom). How could I soulve that?

    – L'utilisatrice
    Nov 26 '18 at 1:18













  • If you want to have your origin in the upper left corner, you can set origin='upper'

    – pxe
    Nov 26 '18 at 1:28











  • Thank you so much! It's working now.

    – L'utilisatrice
    Nov 26 '18 at 11:58
















0














matshow takes arguments for origin and alpha. The rest is just settings ticks and labels.



ax.matshow(matrix, origin='lower', alpha=0, cmap=None, interpolation='nearest')



tick_labels = range(high_dim)

ax.set_xticks(, minor=False)

ax.set_xticks(np.arange(-.5, 20, 1), minor=True)

ax.set_yticks(, minor=False)

ax.set_yticks(np.arange(-.5, 20, 1), minor=True)

ax.set_xticklabels(, minor=False)

ax.set_xticklabels(tick_labels, minor=True)

ax.set_yticklabels(, minor=False)

ax.set_yticklabels(tick_labels, minor=True)

ax.xaxis.set_ticks_position('bottom')

ax.grid(which='minor', color='grey', linestyle='-', linewidth=1)





share|improve this answer
























  • I ran the code and the result was a little problem I faced before and wasn't capable of solving: That's the resulted matrix in the console (I print it first in the console to check if the plot code is fine) ---> i.imgur.com/JpS5ZJF.jpg, and that's the plot generated ---> i.imgur.com/4RRiXU3.jpg. Notice that the lines are "upside down", and so are the index of y axis (19 at top, 0 at bottom). How could I soulve that?

    – L'utilisatrice
    Nov 26 '18 at 1:18













  • If you want to have your origin in the upper left corner, you can set origin='upper'

    – pxe
    Nov 26 '18 at 1:28











  • Thank you so much! It's working now.

    – L'utilisatrice
    Nov 26 '18 at 11:58














0












0








0







matshow takes arguments for origin and alpha. The rest is just settings ticks and labels.



ax.matshow(matrix, origin='lower', alpha=0, cmap=None, interpolation='nearest')



tick_labels = range(high_dim)

ax.set_xticks(, minor=False)

ax.set_xticks(np.arange(-.5, 20, 1), minor=True)

ax.set_yticks(, minor=False)

ax.set_yticks(np.arange(-.5, 20, 1), minor=True)

ax.set_xticklabels(, minor=False)

ax.set_xticklabels(tick_labels, minor=True)

ax.set_yticklabels(, minor=False)

ax.set_yticklabels(tick_labels, minor=True)

ax.xaxis.set_ticks_position('bottom')

ax.grid(which='minor', color='grey', linestyle='-', linewidth=1)





share|improve this answer













matshow takes arguments for origin and alpha. The rest is just settings ticks and labels.



ax.matshow(matrix, origin='lower', alpha=0, cmap=None, interpolation='nearest')



tick_labels = range(high_dim)

ax.set_xticks(, minor=False)

ax.set_xticks(np.arange(-.5, 20, 1), minor=True)

ax.set_yticks(, minor=False)

ax.set_yticks(np.arange(-.5, 20, 1), minor=True)

ax.set_xticklabels(, minor=False)

ax.set_xticklabels(tick_labels, minor=True)

ax.set_yticklabels(, minor=False)

ax.set_yticklabels(tick_labels, minor=True)

ax.xaxis.set_ticks_position('bottom')

ax.grid(which='minor', color='grey', linestyle='-', linewidth=1)






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 26 '18 at 0:56









pxepxe

1207




1207













  • I ran the code and the result was a little problem I faced before and wasn't capable of solving: That's the resulted matrix in the console (I print it first in the console to check if the plot code is fine) ---> i.imgur.com/JpS5ZJF.jpg, and that's the plot generated ---> i.imgur.com/4RRiXU3.jpg. Notice that the lines are "upside down", and so are the index of y axis (19 at top, 0 at bottom). How could I soulve that?

    – L'utilisatrice
    Nov 26 '18 at 1:18













  • If you want to have your origin in the upper left corner, you can set origin='upper'

    – pxe
    Nov 26 '18 at 1:28











  • Thank you so much! It's working now.

    – L'utilisatrice
    Nov 26 '18 at 11:58



















  • I ran the code and the result was a little problem I faced before and wasn't capable of solving: That's the resulted matrix in the console (I print it first in the console to check if the plot code is fine) ---> i.imgur.com/JpS5ZJF.jpg, and that's the plot generated ---> i.imgur.com/4RRiXU3.jpg. Notice that the lines are "upside down", and so are the index of y axis (19 at top, 0 at bottom). How could I soulve that?

    – L'utilisatrice
    Nov 26 '18 at 1:18













  • If you want to have your origin in the upper left corner, you can set origin='upper'

    – pxe
    Nov 26 '18 at 1:28











  • Thank you so much! It's working now.

    – L'utilisatrice
    Nov 26 '18 at 11:58

















I ran the code and the result was a little problem I faced before and wasn't capable of solving: That's the resulted matrix in the console (I print it first in the console to check if the plot code is fine) ---> i.imgur.com/JpS5ZJF.jpg, and that's the plot generated ---> i.imgur.com/4RRiXU3.jpg. Notice that the lines are "upside down", and so are the index of y axis (19 at top, 0 at bottom). How could I soulve that?

– L'utilisatrice
Nov 26 '18 at 1:18







I ran the code and the result was a little problem I faced before and wasn't capable of solving: That's the resulted matrix in the console (I print it first in the console to check if the plot code is fine) ---> i.imgur.com/JpS5ZJF.jpg, and that's the plot generated ---> i.imgur.com/4RRiXU3.jpg. Notice that the lines are "upside down", and so are the index of y axis (19 at top, 0 at bottom). How could I soulve that?

– L'utilisatrice
Nov 26 '18 at 1:18















If you want to have your origin in the upper left corner, you can set origin='upper'

– pxe
Nov 26 '18 at 1:28





If you want to have your origin in the upper left corner, you can set origin='upper'

– pxe
Nov 26 '18 at 1:28













Thank you so much! It's working now.

– L'utilisatrice
Nov 26 '18 at 11:58





Thank you so much! It's working now.

– L'utilisatrice
Nov 26 '18 at 11:58




















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