Plot seems to fail

[danyill]

For: https://cloud.sagemath.com/projects/2a2796e2-e818-4f4b-928f-e111b1bdcf75/files/Cap_Calc_R135_for_mod.sagews

This used to work quite well, now I get errors associated with the plot command:

def simpler_equations_interact(C_val = slider(range(1,100000), default = 1)):
    a=plot([arrow2d(tailpoint=(0, 0), headpoint=CC(eq122_cap(C_val*10**-9)), color='red', legend_label="$V_{R_{1}}$", legend_color='black'),
            arrow2d(tailpoint=(0, 0), headpoint=CC(magang(vnom_val,-120)), color='yellow', legend_label="$V_{Y_{1}}$", legend_color='black'),
            arrow2d(tailpoint=(0, 0), headpoint=CC(magang(vnom_val,-240)), color='blue', legend_label="$V_{B_{1}}$", legend_color='black'),
            arrow2d(tailpoint=(0, 0), headpoint=CC(eq122_cap(C_val*10**-9)+magang(vnom_val,-120)+magang(vnom_val,-240)), color='green', legend_label="$3V_0$", legend_color='black',width=2)],
                legend_label='result phasors',
                legend_color='green',
                title="Changing R phase source impedance, $R_{RS}$ from 1$\Omega$ to 20k$\Omega$ to simulate evolving open-circuit",
                xmin=-190,xmax=190,ymin=-190,ymax=190,
                scale='linear')
    a.show(xmin=-190,ymin=-190,xmax=190,ymax=190)

The error I get is:

Error in lines 1-1
Traceback (most recent call last):
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 905, in execute
    exec compile(block+'\n', '', 'single') in namespace, locals
  File "", line 1, in <module>
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1055, in _execute_interact
    sage_salvus.interacts[id](vals)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 216, in __call__
    self._f(**dict([(k,self._last_vals[k]) for k in self._args]))
  File "", line 11, in simpler_equations_interact
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 705, in wrapper
    return func(*args, **kwds)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 550, in wrapper
    return func(*args, **options)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/plot/plot.py", line 1310, in plot
    G = _plot(funcs, (xmin, xmax), **kwds)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/plot/plot.py", line 1467, in _plot
    fillcolor = fillcolor_temp, **options_temp)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 705, in wrapper
    return func(*args, **kwds)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 550, in wrapper
    return func(*args, **options)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/plot/plot.py", line 1301, in plot
    G = funcs.plot(*args, **original_opts)
TypeError: plot() takes exactly 1 argument (16 given)

I can't see a reason for this. I have looked at the plot help. Has there been a breaking change in the plot command?

I can replicate in a new worksheet with:

b=[arrow2d(tailpoint=(0, 0), headpoint=(1,4), color='red', legend_label="$V_{R_{1}}$", legend_color='black'),
   arrow2d(tailpoint=(0, 0), headpoint=(1,3), color='yellow', legend_label="$V_{Y_{1}}$", legend_color='black'),
   arrow2d(tailpoint=(0, 0), headpoint=(1,2), color='blue', legend_label="$V_{B_{1}}$", legend_color='black'),
   arrow2d(tailpoint=(0, 0), headpoint=(1,1), color='green', legend_label="$3V_0$", legend_color='black',width=2)]
a=plot(b)

which gives the error:

Error in lines 5-5
Traceback (most recent call last):
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 905, in execute
    exec compile(block+'\n', '', 'single') in namespace, locals
  File "", line 1, in <module>
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 705, in wrapper
    return func(*args, **kwds)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 550, in wrapper
    return func(*args, **options)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/plot/plot.py", line 1310, in plot
    G = _plot(funcs, (xmin, xmax), **kwds)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/plot/plot.py", line 1467, in _plot
    fillcolor = fillcolor_temp, **options_temp)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 705, in wrapper
    return func(*args, **kwds)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/misc/decorators.py", line 550, in wrapper
    return func(*args, **options)
  File "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/plot/plot.py", line 1301, in plot
    G = funcs.plot(*args, **original_opts)
TypeError: plot() takes exactly 1 argument (15 given)

I hope this is not a silly issue...

[williamstein]

You can't do plot([a graphics object, ...]). The plot function takes as input a function (and other parameters), not a graphics object. When you write plot(b) above are you trying to superimpose the four arrows? In that case, do sum(b), like this:

https://cloud.sagemath.com/projects/4a5f0542-5873-4eed-a85c-a18c706e8bcd/files/support/2016-01-26-121025-plot-add.sagews

[danyill]

Thank you - sorry this was a silly question. This did work in SMC not long ago and so I was not sure why the behaviour changed.

[williamstein]

You are definitely write that this work in Sage-6.9 but does not work in Sage-6.10. I don't know why Sage changed this way to no longer allow this construction.