

Hii Folks
I have an array with dimension (plev: 7, lat: 81). I was trying to draw streamline plot for Omega and V wind [Hadley cell]. I am facing some error with plt.streamplot as it says that both the dimension should be of equal size (i.e. N * N ). Is there any other way to create a streamline plot for the data having unequal values along both the dimensions?
I seek help of the community in this regard.
I hope I framed my question correctly. Please let me know if I need to clarify more details.
Thank you
 ======================================== Dhirendra Kumar PhD Student
School of Environmental Sciences, JNU
New Delhi (India) Contact: +91 9910778043 =========================================
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Hi Kumar,
Could provided a snippet with a (standalone) minimal working example of what you have tried ?
AFAICT, looking at https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.streamplot.html it does not look like X and Y arrays of coordinates have to be of equal length (but the velocity arrays U and V should have relevant dimensions relative to X and Y).
Best regards,
Adrien
On April 16, 2019 11:05:01 PM GMT+02:00, Dhirendra Kumar < [hidden email]> wrote:
>Hii Folks
>
>I have an array with dimension (plev: 7, lat: 81). I was trying to draw
>streamline plot for Omega and V wind [Hadley cell]. I am facing some
>error
>with* plt.streamplot* as it says that both the dimension should be of
>equal
>size (i.e. N * N ). Is there any other way to create a streamline plot
>for
>the data having unequal values along both the dimensions?
>
>I seek help of the community in this regard.
>
>I hope I framed my question correctly. Please let me know if I need to
>clarify more details.
>
>Thank you

Envoyé de mon appareil Android avec Courriel K9 Mail. Veuillez excuser ma brièveté.
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Kumar,
FWIW, based on the [streamplot
example]( https://matplotlib.org/gallery/images_contours_and_fields/plot_streamplot.html)
in the gallery, the following snippet seems to be working just fine
(with Matplotlib 3.0.1) “even though” the amount of X and Y coordinate
values is (Nx, Ny) = (100, 50).
```python
import numpy as np
import matplotlib.pyplot as plt
# Dummy data
w = 3
Nx, Ny = 100, 50
Y, X = np.mgrid[w:w:50j, w:w:100j]
U = 1  X**2 + Y
V = 1 + X  Y**2
fig, ax = plt.subplots()
ax.streamplot(X, Y, U, V)
ax.set_title(f"{Nx/Ny:g}× more points along X than Y")
```
Best,
Adrien
Le 17/04/2019 à 08:14, Adrien VINCENT a écrit :
> Hi Kumar,
>
> Could provided a snippet with a (standalone) minimal working example of what you have tried ?
>
> AFAICT, looking at https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.streamplot.html it does not look like X and Y arrays of coordinates have to be of equal length (but the velocity arrays U and V should have relevant dimensions relative to X and Y).
>
> Best regards,
> Adrien
>
>
>
> On April 16, 2019 11:05:01 PM GMT+02:00, Dhirendra Kumar < [hidden email]> wrote:
>> Hii Folks
>>
>> I have an array with dimension (plev: 7, lat: 81). I was trying to draw
>> streamline plot for Omega and V wind [Hadley cell]. I am facing some
>> error
>> with* plt.streamplot* as it says that both the dimension should be of
>> equal
>> size (i.e. N * N ). Is there any other way to create a streamline plot
>> for
>> the data having unequal values along both the dimensions?
>>
>> I seek help of the community in this regard.
>>
>> I hope I framed my question correctly. Please let me know if I need to
>> clarify more details.
>>
>> Thank you
>
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Hii Adrien
Thanks for the reply. I have tried your example and could replicate it. But in case of my script I have two variables:
V and Omega having sizes: ([('plev', 12), ('lat', 81)])) ([('plev', 12), ('lat', 81)]))
Plev has to be plotted on y axis and lat has to be plotted on x axis.
I am using following lines to create the plot:
plt.subplot(331) plt.contourf(CC_W_CON11,cmap='RdBu') plt.streamplot(X, Y, Omega, V)
This gives me an error as:
File "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/pyplot.py", line 2951, in streamplot if data is not None else {})) File "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/__init__.py", line 1810, in inner return func(ax, *args, **kwargs) File "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/axes/_axes.py", line 4882, in streamplot integration_direction=integration_direction) File "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/streamplot.py", line 79, in streamplot grid = Grid(x, y) File "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/streamplot.py", line 311, in __init__ raise ValueError("The rows of 'x' must be equal") ValueError: The rows of 'x' must be equal
Could you please look if there is any mistake ??
Thanks
Kumar,
FWIW, based on the [streamplot
example](https://matplotlib.org/gallery/images_contours_and_fields/plot_streamplot.html)
in the gallery, the following snippet seems to be working just fine
(with Matplotlib 3.0.1) “even though” the amount of X and Y coordinate
values is (Nx, Ny) = (100, 50).
```python
import numpy as np
import matplotlib.pyplot as plt
# Dummy data
w = 3
Nx, Ny = 100, 50
Y, X = np.mgrid[w:w:50j, w:w:100j]
U = 1  X**2 + Y
V = 1 + X  Y**2
fig, ax = plt.subplots()
ax.streamplot(X, Y, U, V)
ax.set_title(f"{Nx/Ny:g}× more points along X than Y")
```
Best,
Adrien
Le 17/04/2019 à 08:14, Adrien VINCENT a écrit :
> Hi Kumar,
>
> Could provided a snippet with a (standalone) minimal working example of what you have tried ?
>
> AFAICT, looking at https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.streamplot.html it does not look like X and Y arrays of coordinates have to be of equal length (but the velocity arrays U and V should have relevant dimensions relative to X and Y).
>
> Best regards,
> Adrien
>
>
>
> On April 16, 2019 11:05:01 PM GMT+02:00, Dhirendra Kumar <[hidden email]> wrote:
>> Hii Folks
>>
>> I have an array with dimension (plev: 7, lat: 81). I was trying to draw
>> streamline plot for Omega and V wind [Hadley cell]. I am facing some
>> error
>> with* plt.streamplot* as it says that both the dimension should be of
>> equal
>> size (i.e. N * N ). Is there any other way to create a streamline plot
>> for
>> the data having unequal values along both the dimensions?
>>
>> I seek help of the community in this regard.
>>
>> I hope I framed my question correctly. Please let me know if I need to
>> clarify more details.
>>
>> Thank you
>
 ======================================== Dhirendra Kumar PhD Student
School of Environmental Sciences, JNU
New Delhi (India) Contact: +91 9910778043 =========================================
_______________________________________________
Matplotlibusers mailing list
[hidden email]
https://mail.python.org/mailman/listinfo/matplotlibusers


Kumar,
As far as I understand it, it looks like your issue may be due to X (and
possibly Y) being 2darray. If V and Omega are arrays with shape **(Ny,
Nx)**, then X and Y should be **1darrays** with Nx and Ny elements
respectively. For simplicity sake (I guess), there is actually a special
(not very well documented) case if X and Y are 2darrays :
 each row of X has to be the same;
 each column in Y has to be same.
The error that you saw suggest that the rows in your array X differ from
one another.
Adrien
Le 17/04/2019 à 11:55, Dhirendra Kumar a écrit :
> Hii Adrien
>
> Thanks for the reply. I have tried your example and could replicate it.
> But in case of my script I have two variables:
>
> *V* and *Omega* having sizes:
> ([('plev', 12), ('lat', 81)]))
> ([('plev', 12), ('lat', 81)]))
>
> Plev has to be plotted on y axis and lat has to be plotted on x axis.
>
> I am using following lines to create the plot:
>
> plt.subplot(331)
> plt.contourf(CC_W_CON11,cmap='RdBu')
> plt.streamplot(X, Y, Omega, V)
>
> This gives me an error as:
>
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/pyplot.py",
> line 2951, in streamplot
> if data is not None else {}))
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/__init__.py",
> line 1810, in inner
> return func(ax, *args, **kwargs)
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/axes/_axes.py",
> line 4882, in streamplot
> integration_direction=integration_direction)
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/streamplot.py",
> line 79, in streamplot
> grid = Grid(x, y)
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/streamplot.py",
> line 311, in __init__
> raise ValueError("The rows of 'x' must be equal")
> *ValueError: The rows of 'x' must be equal*
> *
> *
> Could you please look if there is any mistake ??
>
> Thanks
>
>
> On Wed, Apr 17, 2019 at 1:27 PM [hidden email]
> <mailto: [hidden email]> < [hidden email]
> <mailto: [hidden email]>> wrote:
>
> Kumar,
>
> FWIW, based on the [streamplot
> example]( https://matplotlib.org/gallery/images_contours_and_fields/plot_streamplot.html)
> in the gallery, the following snippet seems to be working just fine
> (with Matplotlib 3.0.1) “even though” the amount of X and Y coordinate
> values is (Nx, Ny) = (100, 50).
>
> ```python
> import numpy as np
> import matplotlib.pyplot as plt
>
> # Dummy data
> w = 3
> Nx, Ny = 100, 50
> Y, X = np.mgrid[w:w:50j, w:w:100j]
> U = 1  X**2 + Y
> V = 1 + X  Y**2
>
> fig, ax = plt.subplots()
>
> ax.streamplot(X, Y, U, V)
> ax.set_title(f"{Nx/Ny:g}× more points along X than Y")
> ```
>
> Best,
> Adrien
>
> Le 17/04/2019 à 08:14, Adrien VINCENT a écrit :
> > Hi Kumar,
> >
> > Could provided a snippet with a (standalone) minimal working
> example of what you have tried ?
> >
> > AFAICT, looking at
> https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.streamplot.html> it does not look like X and Y arrays of coordinates have to be of
> equal length (but the velocity arrays U and V should have relevant
> dimensions relative to X and Y).
> >
> > Best regards,
> > Adrien
> >
> >
> >
> > On April 16, 2019 11:05:01 PM GMT+02:00, Dhirendra Kumar
> < [hidden email] <mailto: [hidden email]>> wrote:
> >> Hii Folks
> >>
> >> I have an array with dimension (plev: 7, lat: 81). I was trying
> to draw
> >> streamline plot for Omega and V wind [Hadley cell]. I am facing some
> >> error
> >> with* plt.streamplot* as it says that both the dimension should be of
> >> equal
> >> size (i.e. N * N ). Is there any other way to create a streamline
> plot
> >> for
> >> the data having unequal values along both the dimensions?
> >>
> >> I seek help of the community in this regard.
> >>
> >> I hope I framed my question correctly. Please let me know if I
> need to
> >> clarify more details.
> >>
> >> Thank you
> >
>
>
>
> 
> ========================================
> Dhirendra Kumar
> PhD Student
> School of Environmental Sciences, JNU
> New Delhi (India)
> Contact: +91 9910778043
> Alternate email: [hidden email]
> <mailto: [hidden email]>
> =========================================
_______________________________________________
Matplotlibusers mailing list
[hidden email]
https://mail.python.org/mailman/listinfo/matplotlibusers


Hii Adrien
 x, y : 1d arrays
 an evenly spaced grid.
 but in my case although I have the same shape of the V and Omega values, it is unevenly distributed as a grid. The plev values are: [1000. 925. 850. 700. 600. 500. 400. 300. 250. 200. 150. 100.] while x varies from 040 N at an interval of 0.5. So apparently it produces an unevely distributed gridspace in latplev (xy).
 Please let me know what you think about this.
 Thanks
 Dhirendra
Kumar,
As far as I understand it, it looks like your issue may be due to X (and
possibly Y) being 2darray. If V and Omega are arrays with shape **(Ny,
Nx)**, then X and Y should be **1darrays** with Nx and Ny elements
respectively. For simplicity sake (I guess), there is actually a special
(not very well documented) case if X and Y are 2darrays :
 each row of X has to be the same;
 each column in Y has to be same.
The error that you saw suggest that the rows in your array X differ from
one another.
Adrien
Le 17/04/2019 à 11:55, Dhirendra Kumar a écrit :
> Hii Adrien
>
> Thanks for the reply. I have tried your example and could replicate it.
> But in case of my script I have two variables:
>
> *V* and *Omega* having sizes:
> ([('plev', 12), ('lat', 81)]))
> ([('plev', 12), ('lat', 81)]))
>
> Plev has to be plotted on y axis and lat has to be plotted on x axis.
>
> I am using following lines to create the plot:
>
> plt.subplot(331)
> plt.contourf(CC_W_CON11,cmap='RdBu')
> plt.streamplot(X, Y, Omega, V)
>
> This gives me an error as:
>
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/pyplot.py",
> line 2951, in streamplot
> if data is not None else {}))
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/__init__.py",
> line 1810, in inner
> return func(ax, *args, **kwargs)
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/axes/_axes.py",
> line 4882, in streamplot
> integration_direction=integration_direction)
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/streamplot.py",
> line 79, in streamplot
> grid = Grid(x, y)
> File
> "/opt/apps/ANACONDA/lib/python3.7/sitepackages/matplotlib/streamplot.py",
> line 311, in __init__
> raise ValueError("The rows of 'x' must be equal")
> *ValueError: The rows of 'x' must be equal*
> *
> *
> Could you please look if there is any mistake ??
>
> Thanks
>
>
> On Wed, Apr 17, 2019 at 1:27 PM [hidden email]
> <mailto:[hidden email]> <[hidden email]
> <mailto:[hidden email]>> wrote:
>
> Kumar,
>
> FWIW, based on the [streamplot
> example](https://matplotlib.org/gallery/images_contours_and_fields/plot_streamplot.html)
> in the gallery, the following snippet seems to be working just fine
> (with Matplotlib 3.0.1) “even though” the amount of X and Y coordinate
> values is (Nx, Ny) = (100, 50).
>
> ```python
> import numpy as np
> import matplotlib.pyplot as plt
>
> # Dummy data
> w = 3
> Nx, Ny = 100, 50
> Y, X = np.mgrid[w:w:50j, w:w:100j]
> U = 1  X**2 + Y
> V = 1 + X  Y**2
>
> fig, ax = plt.subplots()
>
> ax.streamplot(X, Y, U, V)
> ax.set_title(f"{Nx/Ny:g}× more points along X than Y")
> ```
>
> Best,
> Adrien
>
> Le 17/04/2019 à 08:14, Adrien VINCENT a écrit :
> > Hi Kumar,
> >
> > Could provided a snippet with a (standalone) minimal working
> example of what you have tried ?
> >
> > AFAICT, looking at
> https://matplotlib.org/api/_as_gen/matplotlib.axes.Axes.streamplot.html
> it does not look like X and Y arrays of coordinates have to be of
> equal length (but the velocity arrays U and V should have relevant
> dimensions relative to X and Y).
> >
> > Best regards,
> > Adrien
> >
> >
> >
> > On April 16, 2019 11:05:01 PM GMT+02:00, Dhirendra Kumar
> <[hidden email] <mailto:[hidden email]>> wrote:
> >> Hii Folks
> >>
> >> I have an array with dimension (plev: 7, lat: 81). I was trying
> to draw
> >> streamline plot for Omega and V wind [Hadley cell]. I am facing some
> >> error
> >> with* plt.streamplot* as it says that both the dimension should be of
> >> equal
> >> size (i.e. N * N ). Is there any other way to create a streamline
> plot
> >> for
> >> the data having unequal values along both the dimensions?
> >>
> >> I seek help of the community in this regard.
> >>
> >> I hope I framed my question correctly. Please let me know if I
> need to
> >> clarify more details.
> >>
> >> Thank you
> >
>
>
>
> 
> ========================================
> Dhirendra Kumar
> PhD Student
> School of Environmental Sciences, JNU
> New Delhi (India)
> Contact: +91 9910778043
> Alternate email: [hidden email]
> <mailto:[hidden email]>
> =========================================
 ======================================== Dhirendra Kumar PhD Student
School of Environmental Sciences, JNU
New Delhi (India) Contact: +91 9910778043 =========================================
_______________________________________________
Matplotlibusers mailing list
[hidden email]
https://mail.python.org/mailman/listinfo/matplotlibusers

