 # plot(x,y) Trouble?

I find this puzzling. It seems as though the x,y points in some fashion can vary.

plot(2.8,3.4) doesn't work in my program
plot([2.8],[3.4]) does work
plot((2.8,3.4)) apparently creates two points

fig = figure()
v = (0, 640, 0, 480) # min, max on x and y
ax1.plot(xy[:,0], xy[:,1]) # draw all the lines
title(afname)
ylabel('vertical pixels')
xlabel('horizontal pixels')
# An attempt to draw an easy large circle. It worked, but zoom moves the circle. 320,235 not locked
# If use (320,235), then get two circles.
# ax1.plot(,, marker='o', mfc='y', ms=400) # draw large circle
ax1.plot([xy[0,0]],[xy[0,1]],'gs') # place marker at start. Had to "list-ize" array columns, but seems right
ax1.plot([xy[npts-1,0]], [xy[npts-1,1]],'rs') # mark it is a last frame. More list-izing, but seems right
ax1.plot([xy[k_max,0]], [xy[k_max,1]], marker='+', mec='g', ms=15) # mark maximum dist frame. Same listizing
# Next is required for what I'm pretty sure are float64 numbers
ax1.plot([amax_x], [amax_y], marker='o', mec='m',ms=5) # mark max amplitude.
ax1.axis(v)
show()

I think the zoom difficulty can be handled with patches. An area I have yet to probe.

···

--
"There is nothing so annoying as to have two people
talking when you're busy interrupting." -- Mark Twain

plot(2.8,3.4) doesn't work in my program

Why should it?
Plot takes once or two *sequences* of numbers as arguments.

plot([2.8],[3.4]) does work

Well yes, that is two sequences.

plot((2.8,3.4)) apparently creates two points

Yes, if you only provide one sequence,
it is treated as the ordinates (i.e., second coordinates),
and the abscissas are generated for you.

See the examples in the documentation:
http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.plot

Alan Isaac

···

On 2/21/2010 10:29 AM, Wayne Watson wrote:

Wayne's confusion on the admissible arguments to 'plot' led me to look
again at the documentation. I suggest adding the following as the second
sentence:

Here x and y are sequences of numbers,
which are the first and second coordinates
of the points to be plotted.

Alan Isaac

···

On 2/21/2010 10:44 AM, Alan G Isaac wrote:

http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.plot

Alan G Isaac wrote:

plot(2.8,3.4) doesn't work in my program

Why should it?
Plot takes once or two *sequences* of numbers as arguments.

In more recent versions than the OP has, it can also handle
plot(2.8, 3.4, 'o')

With a single point, of course, one must specify a marker, as above.

Eric

···

On 2/21/2010 10:29 AM, Wayne Watson wrote:

plot([2.8],[3.4]) does work

Well yes, that is two sequences.

plot((2.8,3.4)) apparently creates two points

Yes, if you only provide one sequence,
it is treated as the ordinates (i.e., second coordinates),
and the abscissas are generated for you.

See the examples in the documentation:
http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.plot

Alan Isaac

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Thanks. A small lesson in sequences. I'm slowly beginning to breath Python air.

···

On 2/21/2010 7:44 AM, Alan G Isaac wrote:

On 2/21/2010 10:29 AM, Wayne Watson wrote:

plot(2.8,3.4) doesn't work in my program

Why should it?
Plot takes once or two *sequences* of numbers as arguments.

plot([2.8],[3.4]) does work

Well yes, that is two sequences.

plot((2.8,3.4)) apparently creates two points

Yes, if you only provide one sequence,
it is treated as the ordinates (i.e., second coordinates),
and the abscissas are generated for you.

See the examples in the documentation:
http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.plot

Alan Isaac

------------------------------------------------------------------------------