yozw/lio-ng

Source code for http://online-optimizer.appspot.com.

lio-ng's Issues

Draw the optimal points in the feasible region graph

Show optimal objective value after solving

Displaying results for problems with a large number of variables is really slow

Think about how to improve this. Perhaps don't show the whole table, but only a subset, and add a "view full table" link?

Adaptive function approximation: does it need simplification?

Currently, it looks like there are a lot of points that are well approximated by the linear interpolant. So it seems that some points can be removed.

Eye candy: add animated scrolling

See http://ace.c9.io/build/kitchen-sink.html

The log page isn't scrolling.

Deploy on Google App Engine

Add "export" to other file format

E.g. cplex, and something gurobi-compatible.

The table of variables is incorrect for MIPs

See failing test.

Create a Quickstart

Quickstart that describes in a small number of steps how to use the app: the model, solve, and looking at the solution.

Rename the "Information" tab to "Documentation"

Dialogs sometimes make the window display a scrollbar

Factor out a unified storage service

Service should:

• Recognise URLs pointing at google drive or arbitrary URL (through backend)
• Split model into code and doc

Check IE10/11 compatibility

Automatically set graph bounds

Currently they are hardcoded to be -1 to 10 or something like that.

Add more examples; possibly with submenus in the examples menu

More examples at:
http://winglpk.sourceforge.net/examples/#example1
http://spokutta.wordpress.com/the-gnu-linear-programming-kit-glpk/
http://en.wikibooks.org/wiki/GLPK/Portfolio_Optimization

Submenus could be implemented in the following way:
http://www.bootply.com/86684

Sensitivity analysis: improve behavior under infeasibility/unboundedness

Implement "new model"

Turn variables with 1 or 2 indices into more comprehensible tables

Sensitivity analysis: Infeasibility/unboundedness is wrong way around for minimizing problems

Implement loading arbitrary URLs through a backend

When the model is infeasible or unbounded, model overview and potentially a graph should still be displayed

Implement a sever-side storage mechanism

As soon as the user edits the code, swap the url for a unique id whose code is stored server-side. This is to prevent accidental loss of code.

Links in help should have target="_blank" (when using HTML anchors)

Allow for multiple data sections

Perhaps by adding tabs?

Unbounded feasible regions are not displayed correctly

For example the following problem:

var x1;
var x2;
maximize obj: 0.6 * x1 + 0.5 * x2;
s.t. c1: x1 + 2 * x2 <= 1;
s.t. c2: 3 * x1 + x2 <= 2;
solve;
display x1, x2;
end;

Allow resizing graphs / automatically decide on a good-looking size

Remove header from Model Overview table

Improve presentation on mobile

Currently, the app works poorly on mobile. (e.g. the menu bar disappears), and the screen is not optimally used.

Add link to "OR with GLPK"

http://lipas.uwasa.fi/~tsottine/lecture_notes/or.pdf

Menu bar disappears when the window is too narrow

Sensitivity analysis does not work yet

Maybe use NaCl (native client) or asm.js to speed up the optimizer?

After clicking on a tab, the keyboard focus should be on the content

Use Google Drive for storing models

Integer optimization problems are currently solved as LPs

Ask for confirmation before navigating away

It's annoying when you accidentally click Back, or press Alt-Left

Feedback does not work

Printf output does not show up in console log

Add a "working" indicator

Error handling

Whenever the model has an error, the indicator is stuck on "Loading model" and nothing happens.

Sensitivity analysis: allow for graphing more than just the objective value

This requires pre-solving the model to determine the variables of the model.

Tables should be paginated when too large

Syntax highlighting is missing

Give more information about the example models

Preferably by showing info from the model files in the information tab

Add the possibility to graph variables

Draw the optimal points in the feasible region graph

ui-grid horizontal scrolling

There's a little left-right shift that goes on, as if the grid is a few pixels wide for the panel. Minor thing, but visually a bit odd.

Table formatting

Use a number formatter to decrease the number of significant digits, perhaps right-align numbers ,and replace > 1e308 by "Inf". Also make row/column status labels more understandable.

It should be possible to cancel a calculation