1zad(1)                           User Commands                          zad(1)
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NAME

6       zad - add or subtract matrices
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SYNOPSIS

9       zad [OPTIONS] [-]<Mat> [-]<Mat> ... <Result>
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DESCRIPTION

12       This  program reads two or more input matrices, calculates their sum or
13       difference and writes the result to a file.  The input matrices must be
14       compatible,  i.e.,  they  must be over the same field and have the same
15       dimensions.  Zad is designed to work with very large  matrices  without
16       running out of memory.  Only two rows are allocated as working memory.
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18       By default, all input matrices are added. For example,
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20         zad A B C
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22       calculates  the  sum of A and B, and writes the result to C.  If a file
23       name is preceeded by a minus sign,  this  matrix  is  subtracted.   For
24       example,
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26         zad A -B -C D
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28       calculates  D=A-B-C.   To subtract the first matrix, you must insert an
29       extra "--" before the file names.  Otherwise the first  argument  would
30       be  interpreted as a program option.  For example, to calculate C=-A-B,
31       use
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33         zad -- -A -B C
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35       If a file name starts with "-", preceed the file name by "+" to add, or
36       by  "-" to subtract the matrix.  If, for example, the second input file
37       is "-B", use the following syntax:
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39         zad A +-B C
40         zad A --B C
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OPTIONS

43       -Q     Quiet, no messages.
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45       -V     Verbose, more messages.
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47       -T <MaxTime>
48              Set CPU time limit
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INPUT FILES

51       Mat ...
52              Input matrix or matrices.
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OUTPUT FILES

55       Result Sum of the input matrices.
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59MeatAxe                             2.4.24                              zad(1)