Thanks for your response, and for pointing me to the tips on posting- quite new around here and much appreciate it. Here are some more details, to add to my original question. The matrix looks like this: 
NA 0.0132 0.0116 0.0082 0.0157 0.0246 0.0000 0.0338 0.0000 0.0173
NA NA 0.0084 0.0042 0.0025 0.0126 0.0061 0.0107 0.0214 0.0177
NA NA NA 0.0159 0.0078 0.0216 0.0133 0.0080 0.0029 0.0067    
NA NA NA NA 0.0185 0.0362 0.0167 0.0266 0.0000 0.0093    
NA NA NA NA NA 0.0268 0.0046 0.0134 0.0000 0.0000
NA NA NA NA NA NA 0.0063 0.0112 0.0138 0.0000    
NA NA NA NA NA NA NA 0.0128 0.0239 0.0000    
NA NA NA NA NA NA NA NA 0.0102 0.0188
NA NA NA NA NA NA NA NA NA 0.0088

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The elements are tab separated. All I want in the end, is for the NAs to be replaced by the numbers, no other operations need to be done. I need this because a program I want to run requires the input formatted in this way. I will take a look at PDL as sugegsted. Thanks again, Savita

In reply to Re^2: upper or lower triangular matrix to full by savita
in thread upper or lower triangular matrix to full by savita

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