variable line thickness in a plot

Hi, does anyone know of a way to create lines with variable thickness and color when doing a plot?

Basically, I’d like to have a third dimension represented using thickness. The API for the plot function states that the line thickness can only be a single floating point number.

Thanks

I don't know if this is the easiest way, but it can be done with clever use of fill:

from pylab import *

x = linspace(0,10,101)
y = cos(x)
z = sin(3*x)+2
zn = 0.05*z

xs, ys = mlab.poly_between(x, y-zn, y+zn)
fill(xs, ys)
show()

Best Regards

···

On Tue, Mar 11, 2008 at 12:45:21PM -0700, eliss wrote:

Hi, does anyone know of a way to create lines with variable thickness
and color when doing a plot?
Basically, I'd like to have a third dimension represented using
thickness. The API for the plot function states that the line thickness
can only be a single floating point number.
Thanks

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--
Troels Kofoed Jacobsen
tkjacobsen@...287...
tel: +45 20880798

Really? Try

plot([1,2,3], lw=math.pi)

cheers,
steve

···

On Tue, Mar 11, 2008 at 12:45:21PM -0700, eliss wrote:

The API for the plot function states that the line thickness can only be a
single floating point number.

Thanks for the reply. I couldn’t find the “poly_between” function in mlab. I imported my mlab, and did dir(mlab) but that method doesn’t show up in there. I tried redownloading the latest version of matplotlib as well. Am I missing a library?

···

On 3/11/08, Troels Kofoed Jacobsen <tkjacobsen@…287…> wrote:

On Tue, Mar 11, 2008 at 12:45:21PM -0700, eliss wrote:

Hi, does anyone know of a way to create lines with variable thickness

and color when doing a plot?
Basically, I’d like to have a third dimension represented using
thickness. The API for the plot function states that the line thickness
can only be a single floating point number.

Thanks

I don’t know if this is the easiest way, but it can be done with clever use of fill:

from pylab import *

x = linspace(0,10,101)
y = cos(x)
z = sin(3x)+2
zn = 0.05
z

xs, ys = mlab.poly_between(x, y-zn, y+zn)
fill(xs, ys)
show()

Best Regards

I have version 0.91.2 of matplotlib and for me the function is there.

(I found it in the fill_between.py example)

···

On Tue, Mar 11, 2008 at 01:23:04PM -0700, eliss wrote:

On 3/11/08, Troels Kofoed Jacobsen <[1]tkjacobsen@...287...> wrote:

On Tue, Mar 11, 2008 at 12:45:21PM -0700, eliss wrote:
>
> Hi, does anyone know of a way to create lines with variable
thickness
> and color when doing a plot?
> Basically, I'd like to have a third dimension represented using
> thickness. The API for the plot function states that the line
thickness
> can only be a single floating point number.
> Thanks
I don't know if this is the easiest way, but it can be done with
clever use of fill:
from pylab import *
x = linspace(0,10,101)
y = cos(x)
z = sin(3*x)+2
zn = 0.05*z
xs, ys = mlab.poly_between(x, y-zn, y+zn)
fill(xs, ys)
show()
Best Regards

Thanks for the reply. I couldn't find the "poly_between" function in
mlab. I imported my mlab, and did dir(mlab) but that method doesn't
matplotlib as well. Am I missing a library?

References

1. mailto:tkjacobsen@…287…

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Troels Kofoed Jacobsen
tkjacobsen@...287...
tel: +45 20880798

Ah, my os did not have the latest package in the repository so I had to build it. Works now. Thanks!

···

On 3/11/08, Troels Kofoed Jacobsen <tkjacobsen@…287…> wrote:

On Tue, Mar 11, 2008 at 01:23:04PM -0700, eliss wrote:

On 3/11/08, Troels Kofoed Jacobsen <[1]tkjacobsen@gmail.com> wrote:

`````` On Tue, Mar 11, 2008 at 12:45:21PM -0700, eliss wrote:
>
>    Hi, does anyone know of a way to create lines with variable
thickness
>    and color when doing a plot?
``````
`````` >    Basically, I'd like to have a third dimension represented using
>    thickness. The API for the plot function states that the line
thickness
>    can only be a single floating point number.
``````
`````` >    Thanks
I don't know if this is the easiest way, but it can be done with
clever use of fill:
from pylab import *
x = linspace(0,10,101)
y = cos(x)
``````
`````` z = sin(3*x)+2
zn = 0.05*z
xs, ys = mlab.poly_between(x, y-zn, y+zn)
fill(xs, ys)
show()
Best Regards
``````

Thanks for the reply. I couldn’t find the “poly_between” function in

mlab. I imported my mlab, and did dir(mlab) but that method doesn’t
matplotlib as well. Am I missing a library?

References

1. mailto:tkjacobsen@…287…

This SF.net email is sponsored by: Microsoft

Defy all challenges. Microsoft® Visual Studio 2008.
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Matplotlib-users mailing list
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https://lists.sourceforge.net/lists/listinfo/matplotlib-users

I have version 0.91.2 of matplotlib and for me the function is there.

(I found it in the fill_between.py example)