我不確定跟隨你,但是你使用DataFrame.ix選擇/設置單個元素：

In [79]: M

Out[79]:

one two three four

a -0.277981 1.500188 -0.876751 -0.389292

b -0.705835 0.108890 -1.502786 -0.302773

c 0.880042 -0.056620 -0.550164 -0.409458

d 0.704202 0.619031 0.274018 -1.755726

In [75]: M.ix[0]

Out[75]:

one -0.277981

two 1.500188

three -0.876751

four -0.389292

Name: a

In [78]: M.ix[0,0]

Out[78]: -0.27798082190723405

In [81]: M.ix[0,0] = 1.0

In [82]: M

Out[82]:

one two three four

a 1.000000 1.500188 -0.876751 -0.389292

b -0.705835 0.108890 -1.502786 -0.302773

c 0.880042 -0.056620 -0.550164 -0.409458

d 0.704202 0.619031 0.274018 -1.755726

In [84]: M.ix[(0,1),(0,1)] = 1

In [85]: M

Out[85]:

one two three four

a 1.000000 1.000000 -0.876751 -0.389292

b 1.000000 1.000000 -1.502786 -0.302773

c 0.880042 -0.056620 -0.550164 -0.409458

d 0.704202 0.619031 0.274018 -1.755726

您還可以按索引切片：

In [98]: M.ix["a":"c","one"] = 2.0

In [99]: M

Out[99]:

one two three four

a 2.000000 1.000000 -0.876751 -0.389292

b 2.000000 1.000000 -1.502786 -0.302773

c 2.000000 -0.056620 -0.550164 -0.409458

d 0.704202 0.619031 0.274018 -1.755726

總結

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