NumPy Commands
====================


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| NumPy command                     | Note                                                        |
+===================================+=============================================================+
| a.ndim                            | returns the num. of dimensions or the **rank**              |
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| a.shape                           | returns the num. of rows and colums                         |
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| a.size                            | returns the num. of rows and colums                         |
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| arange(start,stop,step)           | returns a sequence vector                                   |
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| linspace(start,stop,steps)        | returns a evenly spaced sequence in the specificed interval |
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| dot(a,b)                          | matrix multiplication                                       |
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| vstack([a,b])                     | stack arrays a and b vertically                             |
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| hstack([a,b])                     | stack arrays a and b horizontally                           |
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| where(a>x)                        | returns elements from an array depending on condition       |
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| argsort(a)                        | returns the sorted indices of an input array                | 
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