MathAction SandBox Text Files

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    • SandBox Text Files <-- You are here.

This is a simple example of writing to and reading from a text file:

(1) -> f1: TextFile := open("/tmp/test", "output")

writeLine!(f1, "abcdefg")

close! f1

f2: TextFile := open("/tmp/test", "input")

l := readLine! f2

output l

 abcdefg

close! f2

Here is a system command. It display how many files there are in the default current directory where Axiom is run.

)set output algebra on

systemCommand("system ls | wc")

 108558 108571 3471506

Please do not try to list the complete contents of this directory! If you do, MathAction will appear to hang.

Here is a shorter list of files that works ok:

)set output algebra on

systemCommand("system ls .. > /tmp/test")

f2: TextFile := open("/tmp/test", "input")

 (10) "/tmp/test"

while not endOfFile? f2 repeat
 s := readLine! f2
 output s

 Data.fs
 Data.fs.index
 Data.fs.lock
 Data.fs.old
 Data.fs.tmp
 LatexWiki
 README.txt
 Z2.lock
 Z2.pid
 graphviz.pdf.xml
 pts
 revisions.xml
 x.png
 zopectlsock

close! f2

 (12) "/tmp/test"

Here is an example of how to call a polymake constructor. Notice that you must use the full path name.

)set output algebra on

systemCommand("system /usr/local/polymake/bin/cube /tmp/cube4.poly 4 2>/tmp/cube4.stderr >/tmp/cube4.stdout")

Here is the standard output of the command (if any):

systemCommand("system cat /tmp/cube4.stdout")

Here is the error output of the command (if any):

systemCommand("system cat /tmp/cube4.stderr")

sh: 1: /usr/local/polymake/bin/cube: not found

Now display the contents of the file that was created:

f2: TextFile := open("/tmp/cube4.poly", "input")

 >> Error detected within library code:
 "File is not readable""/tmp/cube4.poly"

systemCommand("system /usr/local/polymake/bin/cross /tmp/c4.poly 4")

sh: 1: /usr/local/polymake/bin/cross: not found

systemCommand("system cat /tmp/c4.poly")

cat: /tmp/c4.poly: No such file or directory