python gnuplot.plot 命令在字符串输入命令上失败
例如,在 gnuplot 命令行中,您可以执行
gnuplot>使用 1:2 标题“数据 A”绘制“fileA.dat”,\ 使用 python gnuplot.py使用 1:3 标题“data B”的“fileB.dat”
,以下函数工作正常:
def create_plot():
...
for target in TARGET_LIST:
for protocol in PROTOCOL_LIST:
input_file_name = "%s/%s.db" % (DATA_DIR, target)
shortname = input_file_name.split('/')[-1]
shortname = shortname.rstrip('.db')
input_list = read_lines(input_file_name)
write_plot_file_name = '%s/%s.%s.write.out' % (DATA_DIR, shortname, protocol)
write_plot_file = open(write_plot_file_name, 'w')
read_plot_file_name = '%s/%s.%s.read.out' % (DATA_DIR, shortname, protocol)
read_plot_file = open(read_plot_file_name, 'w')
ping_plot_file_name = '%s/%s.ping.out' % (DATA_DIR, shortname)
ping_plot_file = open(ping_plot_file_name, 'w')
for line in input_list[ limit: ]:
line = line.rstrip("\n")
line_protocol, line_verb, delta, timestamp = line.split('|')
if line_protocol == protocol:
if line_verb == 'write':
write_plot_file.write("%s,%s\n" % (timestamp, delta))
else:
read_plot_file.write("%s,%s\n" % (timestamp, delta))
elif line_protocol == 'ping':
ping_plot_file.write("%s,%s\n" % (timestamp, delta))
#gnuplot stuff
png_file = "%s/%s.%s.png" % (PLOT_DIR, shortname, protocol)
title = '%s history for %s ' % (protocol, shortname)
gnuplot = Gnuplot.Gnuplot()
gnuplot.title(title)
gnuplot('set style data linespoints')
gnuplot('set ylabel "seconds"')
gnuplot('set xlabel "month:day:hour:minute:seconds:millisecond"')
gnuplot('set xdata time')
gnuplot('set timefmt "%s"')
gnuplot('set format x "%m:%d:%H:%M:%S:%MS"')
gnuplot('set xtics nomirror rotate by -90')
gnuplot('set datafile separator ","')
gnuplot('set autoscale')
gnuplot('set grid xtics ytics')
gnuplot('set terminal png size 900,899')
gnuplot('set output "%s"' % (png_file))
cmd = ' "%s" using 1:2 axes x1y1 title "write" with lines, \
"%s" using 1:2 axes x1y1 title "read" with lines, \
"%s" using 1:2 axes x1y2 title "ping" with lines' % \
(write_plot_file_name, read_plot_file_name, ping_plot_file_name)
try:
gnuplot.plot(cmd)
except Error as why:
print "gnuplot choked: %s" % (why)
但是,当我执行 pythonic 操作并将其分解为两个函数时:
def read_data(): #与上面相同的文件/数据进行修改
png_file = "%s/%s.%s.png" % (PLOT_DIR, shortname, protocol)
title = '%s history for %s ' % (protocol, shortname)
cmd = ' "%s" using 1:2 axes x1y1 title "write" with lines, \
"%s" using 1:2 axes x1y1 title "read" with lines, \
"%s" using 1:2 axes x1y2 title "ping" with lines' % \
(write_plot_file_name, read_plot_file_name, ping_plot_file_name)
def create_plot(png_file, title, cmd):
#call the gnuplot 'set' strings as above
gnuplot = Gnuplot.Gnuplot()
gnuplot.title(title)
gnuplot('set style data linespoints')
gnuplot('set ylabel "seconds"')
gnuplot('set xlabel "month:day:hour:minute:seconds:millisecond"')
gnuplot('set xdata time')
gnuplot('set timefmt "%s"')
gnuplot('set format x "%m:%d:%H:%M:%S:%MS"')
gnuplot('set xtics nomirror rotate by -90')
gnuplot('set datafile separator ","')
gnuplot('set autoscale')
gnuplot('set grid xtics ytics')
gnuplot('set terminal png size 900,899')
gnuplot('set output "%s"' % (png_file))`)
gnuplot.plot(cmd)
这会以多种有趣的方式失败,显然是因为 gnuplot 试图绘制字符串本身,而不是像第一种情况那样解释它。
这是怎么回事?有什么办法解决这个问题吗?
in the gnuplot command line you can, for instance, do
gnuplot> plot "fileA.dat" using 1:2 title 'data A', \
"fileB.dat" using 1:3 title 'data B'
using python gnuplot.py, the following function works fine:
def create_plot():
...
for target in TARGET_LIST:
for protocol in PROTOCOL_LIST:
input_file_name = "%s/%s.db" % (DATA_DIR, target)
shortname = input_file_name.split('/')[-1]
shortname = shortname.rstrip('.db')
input_list = read_lines(input_file_name)
write_plot_file_name = '%s/%s.%s.write.out' % (DATA_DIR, shortname, protocol)
write_plot_file = open(write_plot_file_name, 'w')
read_plot_file_name = '%s/%s.%s.read.out' % (DATA_DIR, shortname, protocol)
read_plot_file = open(read_plot_file_name, 'w')
ping_plot_file_name = '%s/%s.ping.out' % (DATA_DIR, shortname)
ping_plot_file = open(ping_plot_file_name, 'w')
for line in input_list[ limit: ]:
line = line.rstrip("\n")
line_protocol, line_verb, delta, timestamp = line.split('|')
if line_protocol == protocol:
if line_verb == 'write':
write_plot_file.write("%s,%s\n" % (timestamp, delta))
else:
read_plot_file.write("%s,%s\n" % (timestamp, delta))
elif line_protocol == 'ping':
ping_plot_file.write("%s,%s\n" % (timestamp, delta))
#gnuplot stuff
png_file = "%s/%s.%s.png" % (PLOT_DIR, shortname, protocol)
title = '%s history for %s ' % (protocol, shortname)
gnuplot = Gnuplot.Gnuplot()
gnuplot.title(title)
gnuplot('set style data linespoints')
gnuplot('set ylabel "seconds"')
gnuplot('set xlabel "month:day:hour:minute:seconds:millisecond"')
gnuplot('set xdata time')
gnuplot('set timefmt "%s"')
gnuplot('set format x "%m:%d:%H:%M:%S:%MS"')
gnuplot('set xtics nomirror rotate by -90')
gnuplot('set datafile separator ","')
gnuplot('set autoscale')
gnuplot('set grid xtics ytics')
gnuplot('set terminal png size 900,899')
gnuplot('set output "%s"' % (png_file))
cmd = ' "%s" using 1:2 axes x1y1 title "write" with lines, \
"%s" using 1:2 axes x1y1 title "read" with lines, \
"%s" using 1:2 axes x1y2 title "ping" with lines' % \
(write_plot_file_name, read_plot_file_name, ping_plot_file_name)
try:
gnuplot.plot(cmd)
except Error as why:
print "gnuplot choked: %s" % (why)
HOWEVER, when I do the pythonic thing and break this into two functions:
def read_data():
#do the same file/data munging above
png_file = "%s/%s.%s.png" % (PLOT_DIR, shortname, protocol)
title = '%s history for %s ' % (protocol, shortname)
cmd = ' "%s" using 1:2 axes x1y1 title "write" with lines, \
"%s" using 1:2 axes x1y1 title "read" with lines, \
"%s" using 1:2 axes x1y2 title "ping" with lines' % \
(write_plot_file_name, read_plot_file_name, ping_plot_file_name)
def create_plot(png_file, title, cmd):
#call the gnuplot 'set' strings as above
gnuplot = Gnuplot.Gnuplot()
gnuplot.title(title)
gnuplot('set style data linespoints')
gnuplot('set ylabel "seconds"')
gnuplot('set xlabel "month:day:hour:minute:seconds:millisecond"')
gnuplot('set xdata time')
gnuplot('set timefmt "%s"')
gnuplot('set format x "%m:%d:%H:%M:%S:%MS"')
gnuplot('set xtics nomirror rotate by -90')
gnuplot('set datafile separator ","')
gnuplot('set autoscale')
gnuplot('set grid xtics ytics')
gnuplot('set terminal png size 900,899')
gnuplot('set output "%s"' % (png_file))`)
gnuplot.plot(cmd)
this fails in any number of interesting ways, apparently because gnuplot is trying to plot the string itself rather than interpret it as it does in the first case.
what's going on here? is there any way around this?
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明白了:
两个函数都没有执行 file.close (坏!坏!),这在单个函数的范围内是可以的 - 文件描述符仍然有效。
当
包含在 read_data() 中时,一切都会更好。
got it:
neither function does a file.close (bad! bad!), which is OK within the scope of a single function- the file descriptor is still valid.
when
is included in read_data() everything is better.