Question

我有一个简单的数据文件要绘制。

以下是数据文件的内容，我将其命名为“ttry”：

  0.27                   0
  0.28                   0
  0.29                   0
   0.3                   0
  0.31                   0
  0.32                   0
  0.33                   0
  0.34                   0
  0.35                   0
  0.36                   0
  0.37                   0
  0.38    0.00728737997257
  0.39     0.0600137174211
   0.4       0.11488340192
  0.41      0.157321673525
  0.42      0.193158436214
  0.43      0.233882030178
  0.44      0.273319615912
  0.45      0.311556927298
  0.46      0.349879972565
  0.47      0.387602880658
  0.48      0.424211248285
  0.49      0.460390946502
   0.5      0.494855967078
  0.51      0.529406721536
  0.52      0.561814128944
  0.53      0.594307270233
  0.54      0.624228395062
  0.55      0.654492455418
  0.56      0.683984910837
  0.57      0.711762688615
  0.58      0.739368998628
  0.59      0.765775034294
   0.6      0.790895061728
  0.61      0.815586419753
  0.62      0.840192043896
  0.63      0.863082990398
  0.64      0.886231138546
  0.65      0.906292866941
  0.66      0.915809327846
  0.67      0.911436899863
  0.68      0.908179012346
  0.69      0.904749657064
   0.7      0.899519890261
  0.71      0.895147462277
  0.72      0.891632373114
  0.73      0.888803155007
  0.74      0.884687928669
  0.75      0.879029492455
  0.76      0.876114540466
  0.77      0.872170781893
  0.78      0.867541152263
  0.79       0.86274005487
   0.8      0.858367626886
  0.81      0.854080932785
  0.82      0.850994513032
  0.83      0.997170781893
  0.84       1.13477366255
  0.85       1.24296982167
  0.86       1.32690329218
  0.87       1.40397805213
  0.88       1.46836419753
  0.89       1.52306241427
   0.9       1.53232167353
  0.91       1.52906378601
  0.92       1.52211934156
  0.93         1.516718107
  0.94       1.51543209877
  0.95       1.50660150892
  0.96       1.50137174211
  0.97       1.49408436214
  0.98       1.48816872428
  0.99       1.48088134431
     1        1.4723079561

然后我使用matplotlib.pyplot.plotfile绘制它。这是我的python脚本

from matplotlib import pyplot
pyplot.plotfile("ttry", cols=(0,1), delimiter=" ")
pyplot.show()

但是出现以下错误：

C:\WINDOWS\system32\cmd.exe /c ttry.py
Traceback (most recent call last):
File "E:\research\ttry.py", line 2, in <module>
pyplot.plotfile("ttry",col=(0,1),delimiter=" ")
File "C:\Python33\lib\site-packages\matplotlib\pyplot.py", line 2311, in plotfile
checkrows=checkrows, delimiter=delimiter, names=names)
File "C:\Python33\lib\site-packages\matplotlib\mlab.py", line 2163, in csv2rec
rows.append([func(name, val) for func, name, val in zip(converters, names, row)])
File "C:\Python33\lib\site-packages\matplotlib\mlab.py", line 2163, in <listcomp>
rows.append([func(name, val) for func, name, val in zip(converters, names, row)])
File "C:\Python33\lib\site-packages\matplotlib\mlab.py", line 2031, in newfunc
return func(val)
ValueError: invalid literal for int() with base 10: '0.00728737997257'
shell returned 1
Hit any key to close this window...

显然，python只将yaxis数据视为int。那么如何告诉python我使用float for yaxis数据？

Answer 1

根据前几个值（即int），它意味着您的第二列的int类型。要使其检查所有行，请将checkrows = 0添加到参数，即：

pyplot.plotfile("ttry", cols=(0,1), delimiter=" ", checkrows = 0)

这是来自matplotlib.mlab.csv2rec的论据，请参阅更多信息here。

python matplotlib plotfile显式使用浮点数

1 个答案: