A MIPVariable's repr should include some useful information

[mkoeppe]

sage: p = MixedIntegerLinearProgram(solver="glpk")
sage: bar = p.new_variable(name="bar")
sage: bar
MIPVariable of dimension 1
sage: bar[0]
x_0
sage: bar
MIPVariable of dimension 1
sage: bar[1]
x_1
sage: bar
MIPVariable of dimension 1
sage: p.solve()
0.0
sage: bar.values()
[x_0, x_1]
sage: p.get_values(bar)
{0: 0.0, 1: 0.0}

I think the print method should instead of "dimension 1" (which apparently means tensor order 1, rather than dimension 1 -- see #17643) print some useful information, such as the name of the variable and the dimension (number of components).

MIPVariable bar with 7 binary components

MIPVariable bar with 5 real components, >= 0, <= 17

CC: @dimpase @videlec @jdemeyer @yuan-zhou

Component: numerical

Author: Yuan Zhou

Branch/Commit: b2b9b36

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/20331

[mkoeppe]

Description changed:

--- 
+++ 
@@ -16,9 +16,6 @@
 0.0
 sage: bar.values()
 [x_0, x_1]
-sage: p.get
-p.get_backend                 p.get_min                     p.get_relative_objective_gap  
-p.get_max                     p.get_objective_value         p.get_values                  
 sage: p.get_values(bar)
 {0: 0.0, 1: 0.0}
 ``` 

[mkoeppe]

Description changed:

--- 
+++ 
@@ -22,3 +22,5 @@
 
 I think the print method should also print some useful information, such as the name of the variable.
 
+Update: Apparently "dimension" was supposed to mean something else, see #17463.
+

[mkoeppe]

Description changed:

--- 
+++ 
@@ -20,7 +20,6 @@
 {0: 0.0, 1: 0.0}
 ``` 
 
-I think the print method should also print some useful information, such as the name of the variable.
+I think the print method should instead of "dimension 1" (which apparently means tensor order 1, rather than dimension 1 -- see #17643) print some useful information, such as the name of the variable and the dimension (number of components).
 
-Update: Apparently "dimension" was supposed to mean something else, see #17463.
 

[mkoeppe]

Description changed:

--- 
+++ 
@@ -22,4 +22,7 @@
 
 I think the print method should instead of "dimension 1" (which apparently means tensor order 1, rather than dimension 1 -- see #17643) print some useful information, such as the name of the variable and the dimension (number of components).
 
+`MIPVariable x with 7 binary components`
 
+`MIPVariable x with 5 real components, >= 0, <= 17`
+

[mkoeppe]

Description changed:

--- 
+++ 
@@ -22,7 +22,7 @@
 
 I think the print method should instead of "dimension 1" (which apparently means tensor order 1, rather than dimension 1 -- see #17643) print some useful information, such as the name of the variable and the dimension (number of components).
 
-`MIPVariable x with 7 binary components`
+`MIPVariable bar with 7 binary components`
 
-`MIPVariable x with 5 real components, >= 0, <= 17`
+`MIPVariable bar with 5 real components, >= 0, <= 17`
 

[yuan-zhou]

Branch: u/yzh/a_mipvariable_s_repr_should_include_some_useful_information

[yuan-zhou]

Author: Yuan Zhou

[yuan-zhou]

New commits:

dbe38b2

change MIPVariable's repr to include useful info

[yuan-zhou]

Commit: dbe38b2

[mkoeppe]

comment:10

It should be "0 real components" (plural)

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

b2b9b36

zero is followed by plural countable nouns

[sagetrac-git]

Changed commit from dbe38b2 to b2b9b36

[mkoeppe]

Reviewer: Matthias Koeppe

[vbraun]

Changed branch from u/yzh/a_mipvariable_s_repr_should_include_some_useful_information to b2b9b36