1 | initial version |

This is a linux box answering. First of all, how does the matrix look like? Is it a piece of code? Is it a csv type?

In my case, the following worked.
I stored in a file named `Matrix.sage`

in the folder `\home\dan\temp`

the following data:

```
1234 928374 1412341 123412431
443313341 13 131134 3414315634
10945203452 2341 122 74532423
9345234 7834192 10234123 99
```

To make things simple (well, for me complicated), i will not use / import `csv`

and take advantage of the offered functionality.

Then the following code parses the lines of the data file line by line, splits the entries w.r.t. the blank (my choice of a delimiter), puts each row obtained in this way in a list, and appends the rows one by one to the variable `rows`

, used to initialize the matrix `A`

in the next line.

```
stream = open( r'/home/dan/temp/Matrix.sage', 'r' )
rows = []
for line in stream.readlines():
rows.append( [ ZZ(entry) for entry in line.strip().split(' ')] )
A = matrix( ZZ, 4, 4, rows )
print( 'The matrix A is as follows:\n{!r}'.format(A) )
print( '\n\ndet(A) = {} = {}'.format(A.det(), A.det().factor()) )
```

This gives:

```
The matrix A is as follows:
[ 1234 928374 1412341 123412431]
[ 443313341 13 131134 3414315634]
[10945203452 2341 122 74532423]
[ 9345234 7834192 10234123 99]
det(A) = 56986363083817785658295994231136 = 2^5 * 7 * 61 * 1136790418207 * 3668704083691007
```

On a Win* box try instead the full path to the `Matrix.sage`

file, for instance

```
stream = open( r'C:\temp\Matrix.sage', 'r' )
```

to open for `r`

ead a presumably existing file that lives under `C:\temp`

.

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