Store GAP REPL representation of expression in string
I have noticed that the representation that is displayed by the GAP REPL (read-evaluate-print loop) when an expression is evaluated sometimes differs from the result of printing that same expression, e.g.:
gap> x:=PartialPerm([1,2],[3,4]);
[1,3][2,4]
gap> Print(x);
PartialPerm( [1, 2], [3, 4] );
Is there some general way to obtain the former string representation outside of an interactive GAP session which will work for any expression? (Or, failing that, a way that works in the special case of partial permutations?)
gap
edited yesterday
Alexander Konovalov
5,16221956
asked yesterday
Peter
1394
add a comment |
I have noticed that the representation that is displayed by the GAP REPL (read-evaluate-print loop) when an expression is evaluated sometimes differs from the result of printing that same expression, e.g.:
gap> x:=PartialPerm([1,2],[3,4]);
[1,3][2,4]
gap> Print(x);
PartialPerm( [1, 2], [3, 4] );
Is there some general way to obtain the former string representation outside of an interactive GAP session which will work for any expression? (Or, failing that, a way that works in the special case of partial permutations?)
gap
edited yesterday
Alexander Konovalov
5,16221956
asked yesterday
Peter
1394
add a comment |
I have noticed that the representation that is displayed by the GAP REPL (read-evaluate-print loop) when an expression is evaluated sometimes differs from the result of printing that same expression, e.g.:
gap> x:=PartialPerm([1,2],[3,4]);
[1,3][2,4]
gap> Print(x);
PartialPerm( [1, 2], [3, 4] );
Is there some general way to obtain the former string representation outside of an interactive GAP session which will work for any expression? (Or, failing that, a way that works in the special case of partial permutations?)
gap
edited yesterday
Alexander Konovalov
5,16221956
asked yesterday
Peter
1394
I have noticed that the representation that is displayed by the GAP REPL (read-evaluate-print loop) when an expression is evaluated sometimes differs from the result of printing that same expression, e.g.:
gap> x:=PartialPerm([1,2],[3,4]);
[1,3][2,4]
gap> Print(x);
PartialPerm( [1, 2], [3, 4] );
Is there some general way to obtain the former string representation outside of an interactive GAP session which will work for any expression? (Or, failing that, a way that works in the special case of partial permutations?)
gap
gap
edited yesterday
Alexander Konovalov
5,16221956
asked yesterday
Peter
1394
edited yesterday
Alexander Konovalov
5,16221956
asked yesterday
Peter
1394
edited yesterday
Alexander Konovalov
5,16221956
edited yesterday
Alexander Konovalov
5,16221956
edited yesterday
Alexander Konovalov
5,16221956
5,16221956
asked yesterday
Peter
1394
asked yesterday
Peter
1394
asked yesterday
Peter
1394
1394
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
GAP has operations DisplayString, ViewSrting and PrintString documented here. Usually, displaying an object produces a human-readable relatively complete and verbose output, viewing produces a short and concise output, and printing produces an output in a complete form which is GAP readable (if at all possible), such that reading the output into GAP produces an object which is equal to the original one.
Depending on the type of the object, they may delegate to each other in the order specified here.
In the example in question, we have
gap> PrintString(x);
"PartialPerm( >[ 1, 2 ], <>[ 3, 4 ]<> )<"
gap> ViewString(x);
">[>1<,>3<<]>[>2<,>4<<]"
gap> DisplayString(x);
"<object>n"
As you see, the output have additional control characters < (ASCII 1) and > (ASCII 2) that allow proper line breaks. The function StripLineBreakCharacters (see here) may be used to remove them:
gap> StripLineBreakCharacters(PrintString(x));
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
gap> StripLineBreakCharacters(ViewString(x));
"[1,3][2,4]"
gap> StripLineBreakCharacters(DisplayString(x));
"<object>n"
There is also String (see here) which should approximate as closely as possible the character sequence you see if you print an object:
gap> String(x);
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
Perhaps for partial permutations that's the best option.
answered yesterday
Alexander Konovalov
5,16221956
Thanks, very helpful (although it feels like this shouldn't be this complicated but I guess that's on GAP).
– Peter
yesterday
There is alsoString- will update the answer now.
– Alexander Konovalov
yesterday
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
return StackExchange.using("mathjaxEditing", function () {
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
});
});
}, "mathjax-editing");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "69"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3060566%2fstore-gap-repl-representation-of-expression-in-string%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
GAP has operations DisplayString, ViewSrting and PrintString documented here. Usually, displaying an object produces a human-readable relatively complete and verbose output, viewing produces a short and concise output, and printing produces an output in a complete form which is GAP readable (if at all possible), such that reading the output into GAP produces an object which is equal to the original one.
Depending on the type of the object, they may delegate to each other in the order specified here.
In the example in question, we have
gap> PrintString(x);
"PartialPerm( >[ 1, 2 ], <>[ 3, 4 ]<> )<"
gap> ViewString(x);
">[>1<,>3<<]>[>2<,>4<<]"
gap> DisplayString(x);
"<object>n"
As you see, the output have additional control characters < (ASCII 1) and > (ASCII 2) that allow proper line breaks. The function StripLineBreakCharacters (see here) may be used to remove them:
gap> StripLineBreakCharacters(PrintString(x));
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
gap> StripLineBreakCharacters(ViewString(x));
"[1,3][2,4]"
gap> StripLineBreakCharacters(DisplayString(x));
"<object>n"
There is also String (see here) which should approximate as closely as possible the character sequence you see if you print an object:
gap> String(x);
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
Perhaps for partial permutations that's the best option.
answered yesterday
Alexander Konovalov
5,16221956
Thanks, very helpful (although it feels like this shouldn't be this complicated but I guess that's on GAP).
– Peter
yesterday
There is alsoString- will update the answer now.
– Alexander Konovalov
yesterday
add a comment |
GAP has operations DisplayString, ViewSrting and PrintString documented here. Usually, displaying an object produces a human-readable relatively complete and verbose output, viewing produces a short and concise output, and printing produces an output in a complete form which is GAP readable (if at all possible), such that reading the output into GAP produces an object which is equal to the original one.
Depending on the type of the object, they may delegate to each other in the order specified here.
In the example in question, we have
gap> PrintString(x);
"PartialPerm( >[ 1, 2 ], <>[ 3, 4 ]<> )<"
gap> ViewString(x);
">[>1<,>3<<]>[>2<,>4<<]"
gap> DisplayString(x);
"<object>n"
As you see, the output have additional control characters < (ASCII 1) and > (ASCII 2) that allow proper line breaks. The function StripLineBreakCharacters (see here) may be used to remove them:
gap> StripLineBreakCharacters(PrintString(x));
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
gap> StripLineBreakCharacters(ViewString(x));
"[1,3][2,4]"
gap> StripLineBreakCharacters(DisplayString(x));
"<object>n"
There is also String (see here) which should approximate as closely as possible the character sequence you see if you print an object:
gap> String(x);
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
Perhaps for partial permutations that's the best option.
answered yesterday
Alexander Konovalov
5,16221956
Thanks, very helpful (although it feels like this shouldn't be this complicated but I guess that's on GAP).
– Peter
yesterday
There is alsoString- will update the answer now.
– Alexander Konovalov
yesterday
add a comment |
GAP has operations DisplayString, ViewSrting and PrintString documented here. Usually, displaying an object produces a human-readable relatively complete and verbose output, viewing produces a short and concise output, and printing produces an output in a complete form which is GAP readable (if at all possible), such that reading the output into GAP produces an object which is equal to the original one.
Depending on the type of the object, they may delegate to each other in the order specified here.
In the example in question, we have
gap> PrintString(x);
"PartialPerm( >[ 1, 2 ], <>[ 3, 4 ]<> )<"
gap> ViewString(x);
">[>1<,>3<<]>[>2<,>4<<]"
gap> DisplayString(x);
"<object>n"
As you see, the output have additional control characters < (ASCII 1) and > (ASCII 2) that allow proper line breaks. The function StripLineBreakCharacters (see here) may be used to remove them:
gap> StripLineBreakCharacters(PrintString(x));
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
gap> StripLineBreakCharacters(ViewString(x));
"[1,3][2,4]"
gap> StripLineBreakCharacters(DisplayString(x));
"<object>n"
There is also String (see here) which should approximate as closely as possible the character sequence you see if you print an object:
gap> String(x);
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
Perhaps for partial permutations that's the best option.
answered yesterday
Alexander Konovalov
5,16221956
GAP has operations DisplayString, ViewSrting and PrintString documented here. Usually, displaying an object produces a human-readable relatively complete and verbose output, viewing produces a short and concise output, and printing produces an output in a complete form which is GAP readable (if at all possible), such that reading the output into GAP produces an object which is equal to the original one.
Depending on the type of the object, they may delegate to each other in the order specified here.
In the example in question, we have
gap> PrintString(x);
"PartialPerm( >[ 1, 2 ], <>[ 3, 4 ]<> )<"
gap> ViewString(x);
">[>1<,>3<<]>[>2<,>4<<]"
gap> DisplayString(x);
"<object>n"
As you see, the output have additional control characters < (ASCII 1) and > (ASCII 2) that allow proper line breaks. The function StripLineBreakCharacters (see here) may be used to remove them:
gap> StripLineBreakCharacters(PrintString(x));
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
gap> StripLineBreakCharacters(ViewString(x));
"[1,3][2,4]"
gap> StripLineBreakCharacters(DisplayString(x));
"<object>n"
There is also String (see here) which should approximate as closely as possible the character sequence you see if you print an object:
gap> String(x);
"PartialPerm( [ 1, 2 ], [ 3, 4 ] )"
Perhaps for partial permutations that's the best option.
answered yesterday
Alexander Konovalov
5,16221956
edited yesterday
answered yesterday
Alexander Konovalov
5,16221956
answered yesterday
Alexander Konovalov
5,16221956
answered yesterday
Alexander Konovalov
5,16221956
5,16221956
Thanks, very helpful (although it feels like this shouldn't be this complicated but I guess that's on GAP).
– Peter
yesterday
There is alsoString- will update the answer now.
– Alexander Konovalov
yesterday
add a comment |
Thanks, very helpful (although it feels like this shouldn't be this complicated but I guess that's on GAP).
– Peter
yesterday
There is alsoString- will update the answer now.
– Alexander Konovalov
yesterday
Thanks, very helpful (although it feels like this shouldn't be this complicated but I guess that's on GAP).
– Peter
yesterday
Thanks, very helpful (although it feels like this shouldn't be this complicated but I guess that's on GAP).
– Peter
yesterday
There is also
String - will update the answer now.– Alexander Konovalov
yesterday
There is also
String - will update the answer now.– Alexander Konovalov
yesterday
add a comment |
Thanks for contributing an answer to Mathematics Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3060566%2fstore-gap-repl-representation-of-expression-in-string%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
