Dear All,
I'm a new GAP user and a student, I'm working with Grape package in GAP to
learn about graphs.
I tried to execute a "xxx.g" file using "Read" function as given below in
two methods.
Please kindly check the methods I have tried and guide me to correct this
problem.
*Method 1: *
As Read("Path/filename.g"); function is used to read and execute set of
commands in GAP.
I created a file named "Symm_Star_3.g" to create a cayley graph.
*Symm_Star_3.g*
C := CayleyGraph(SymmetricGroup(3),[(1,2),(1,3)]);
Diameter(C);
After executing the Read function I got the below error message.
gap>
Read("C:/Users/Home/Desktop/Collage/Independent_Studies/Programs/Symm_Star_3.g");
Error, Variable: 'CayleyGraph' must have a value
not in any function at line 1 of
C:/Users/Home/Desktop/Collage/Independent_Studies/Programs/Symm_Star_3.g
*As CayleyGraph command is present in grape package , I invoked the grape
package as follows,then executed the .g file*
gap> LoadPackage("grape");
─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Loading GRAPE 4.6.1 (GRaph Algorithms using PErmutation groups)
by Leonard H. Soicher (http://www.maths.qmul.ac.uk/~leonard/).
Homepage: http://www.maths.qmul.ac.uk/~leonard/grape/
─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
true
gap>
Read("C:/Users/Home/Desktop/Collage/Independent_Studies/Programs/Symm_Star_3.g");
gap>
Now after invoking the grape package and then executing the Read function,
is not producing any output as shown above.
*Method 2:*
I tried to invoke the package directly from the .g file as follows.
*Symm_Star_3.g*
*
*
LoadPackage("grape");
C := CayleyGraph(SymmetricGroup(3),[(1,2),(1,3)]);
Diameter(C);
Now executing the Read function , is just invoking the package and not
executing the other commands in the .g file.
gap>
Read("C:/Users/Home/Desktop/Collage/Independent_Studies/Programs/Symm_Star_3.g");
─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Loading GRAPE 4.6.1 (GRaph Algorithms using PErmutation groups)
by Leonard H. Soicher (http://www.maths.qmul.ac.uk/~leonard/).
Homepage: http://www.maths.qmul.ac.uk/~leonard/grape/
─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
gap>
Please guide me to correct this issue and help me to use "Read" function ,
to read a file with set of graph commands, after invoking Grape package.
Thanking you,
Sree Devi.
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