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Get a variable from gnuplot #12

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Get a variable from gnuplot #12

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20 changes: 17 additions & 3 deletions PyGnuplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@
class _FigureList(object):

def __init__(self):
proc = _Popen(['gnuplot', '-p'], shell=False, stdin=_PIPE, universal_newlines=True) # persitant -p
proc = _Popen(['gnuplot', '-p'], shell=False, stdin=_PIPE, stdout=_PIPE, stderr=_PIPE, universal_newlines=True) # persitant -p
self.instance = {0 : [proc, default_term]} # {figure number : [process, terminal type]}
self.n = 0 # currently selected Figure
# Format:
Expand All @@ -45,14 +45,26 @@ def figure(number=None):
number = max(fl.instance) + 1

if number not in fl.instance: # number is new
proc = _Popen(['gnuplot', '-p'], shell=False, stdin=_PIPE, universal_newlines=True)
proc = _Popen(['gnuplot', '-p'], shell=False, stdin=_PIPE, stdout=_PIPE, stderr=_PIPE, universal_newlines=True)
fl.instance[number] = [proc, default_term]

fl.n = number
c('set term ' + str(fl.instance[fl.n][1]) + ' ' + str(fl.n))
return number


def get(command):
'''
Get a variable from gnuplot
pi = gp.get('pi')
Returns a string
'''
proc = fl.instance[fl.n][0] # this is where the process is
proc.stdin.write('print ' + command + '\n')
errs, outs = proc.communicate(timeout=15)
return outs.strip()


def c(command):
'''
Send command to gnuplot
Expand All @@ -63,6 +75,7 @@ def c(command):
proc.stdin.write(command + '\n') # \n 'send return in python 2.7'
proc.stdin.flush() # send the command in python 3.4+


def s(data, filename='tmp.dat'):
'''
saves numbers arrays and text into filename (default = 'tmp.dat)
Expand All @@ -77,10 +90,11 @@ def s(data, filename='tmp.dat'):
file.write(str(data[i][j]))
file.write(' ')
file.write('\n')
if j % 1000 == 0 :
if j % 1000 == 0:
file.flush() # write once after every 1000 entries
file.close() # write the rest


def plot(data, filename='tmp.dat'):
''' Save data into filename (default = 'tmp.dat') and send plot instructions to Gnuplot'''
s(data, filename)
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