如何使用 Python 在文件夹中保存多个图？
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How could I save multiple plots in a folder using Python?
提问by Jesu Kiran Spurgen
Here is my program in python and I am trying to save multiple plots in a single folder but it doesn't seem to work. How could I do this please?
这是我在 python 中的程序，我试图在一个文件夹中保存多个图，但它似乎不起作用。请问我该怎么做？
for i in range(0:244):
plt.figure()
y = numpy.array(Data_EMG[i,:])
x = pylab.linspace(EMG_start, EMG_stop, Amount_samples)
plt.xlabel('Time(ms)')
plt.ylabel('EMG voltage(microV)')
pylab.plot(x, y)
pylab.show(block=True)
采纳答案by Renatius
First of all check the identation. Hopefully your code actually reads
首先检查身。希望您的代码实际上可以读取
for i in range(0:244):
plt.figure()
y = numpy.array(Data_EMG[i,:])
x = pylab.linspace(EMG_start, EMG_stop, Amount_samples)
plt.xlabel('Time(ms)')
plt.ylabel('EMG voltage(microV)')
pylab.plot(x, y)
pylab.show(block=True)
At each iteration you completely generate a new figure. That′s very ineffective. Also you just plot your figure on the screen and not actually save it. Better is
在每次迭代中，您都会完全生成一个新图形。那是非常无效的。此外，您只是在屏幕上绘制您的图形，而不是实际保存它。更好的是
from os import path
data = numpy.array(Data_EMG) # convert complete dataset into numpy-array
x = pylab.linspace(EMG_start, EMG_stop, Amount_samples) # doesn′t change in loop anyway
outpath = "path/of/your/folder/"
fig, ax = plt.subplots() # generate figure with axes
image, = ax.plot(x,data[0]) # initialize plot
ax.xlabel('Time(ms)')
ax.ylabel('EMG voltage(microV)')
plt.draw()
fig.savefig(path.join(outpath,"dataname_0.png")
for i in range(1, len(data)):
image.set_data(x,data[i])
plt.draw()
fig.savefig(path.join(outpath,"dataname_{0}.png".format(i))
Should be much faster.
应该会快很多。
