Extending MatricesYou can increase the size of a matrix by padding it with PadLeft and PadRight. In[1]:=  |
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PadLeft adds the elements to the beginning of the matrix. This example returns a 4 4 sparse matrix. In[3]:=  |
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You can see the result with MatrixForm. In[4]:=  |
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PadRight adds the elements to the end of the matrix; the result is a sparse array. In[5]:=  |
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You can use PadLeft to pad on the right if you specify negative indices. In[6]:=  |
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One important use of the padding functions is to replicate and tile a matrix. In this example the input matrix is extended to have two versions in every row and three in every column. In[7]:=  |
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PadLeft and PadRight have a number of extra features. These are described in the Mathematica documentation.
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