65.23 Printing and Saving Codes

Print( C )

Print prints information about C. This is the same as typing the identifier C at the GAP-prompt.

If the argument is an unrestricted code, information in the form

a (n,M,d)r ... code over GF(q)

is printed, where n is the word length, M the number of elements of the code, d the minimum distance and r the covering radius.

If the argument is a linear code, information in the form

a linear [n,k,d]r ... code over GF(q)

is printed, where n is the word length, k the dimension of the code, d the minimum distance and r the covering radius.

In all cases, if d is not yet known, it is displayed in the form

lowerbound,..,upperbound

and if r is not yet known, it is displayed in the same way.

The function Display gives more information. See Display.

    gap> C1 := ExtendedCode( HammingCode( 3, GF(2) ) );
    a linear [8,4,4]2 extended code
    gap> Print( "This is ", NordstromRobinsonCode(), ". \n");
    This is a (16,256,6)4 Nordstrom-Robinson code over GF(2). 

String( C )

String returns information about C in a string. This function is used by Print (see Print).

Save( filename, C, varname )

Save prints the code C to a file with file name filename. If the file does not exist, it is created. If it does exist, the previous contents are erased, so be careful. The code is saved with variable name varname. The code can be read back by calling Read(filename). The code then has name varname. Note that filename and varname are strings.

    gap> C1 := HammingCode( 4, GF(3) );
    a linear [40,36,3]1 Hamming (4,3) code over GF(3)
    gap> Save( "mycodes.lib", C1, "Ham_4_3");
    gap> Read( "mycodes.lib" ); Ham_4_3;
    a linear [40,36,3]1 Hamming (4,3) code over GF(3)
    gap> Ham_4_3 = C1;
    true 

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