# Python辅导 | ELEC-E7851 Computational User Interface Design 2019

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ELEC-E7851 Computational User Interface Design 2019
Aalto University
Antti Oulasvirta, Niraj Dayama
Assignment 2: Applications of Integer Programming in HCI
General advice: There are two tasks in this assignment. Both are to be done using integer
programming. The first task is somewhat more challenging.
to read the class notes. You might want to use PyCharm for a consolidated installation.
Send questions about installation to the TAs. For queries on the assignment itself please
contact Niraj Dayama <niraj.dayama@aalto.fi>
A2.1 Arrangement of a Linear Menu by association (3 points)
Consider a typical linear menu as discussed during the lecture. However, this time we
do not have frequency values for commands. Instead, you have been provided data for
association values.
The association value Aij specifies the logical interrelation between two commands i
and j. For example, the command Save and the command Save-As are very closely interrelated and hence have association value 1. Similarly, Print and Page-Setup are
closely interrelated and hence have association value 0.9. On the contrary, commands
New and Help are almost unrelated and have the association value 0.
These association values Aij are known constants specified for all pairs of commands
positions for all commands. The objective function is to minimize the distance between
commands where the association is higher. In mathematical terms, if the association
between a pair of commands i and j is Aij and the distance between their positions
within menu is Dij , then your objective is to minimize (Aij times Dij) for all such pairs
of commands i and j
Hint: Use the decision variables and constraints same as the linear menu problem. Add a new
decision variable for the distance between any pair of commands. Correlate the distance decision variable to the location variable.
Reminder: You should attach both a report file (PDF) and any new Python file in the submission
file (ZIP).
Grading: One mark each for the following:
1. Reformulation of objective function via some weights
2. Constraint to compute the distance between any pair of commands
3. Working implementation in Python+Gurobi with objective function and results.
A2.2. Software Control Panel (5 points)
The following description explains subtasks 2.2.1, 2.2.2 and 2.2.3. The specific questions for tasks 2.2.1, 2.2.2 and 2.2.3 are provided after this description.
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Common description: You are designing the control panel for a software application.
The panel consists of 16 different controllable widgets (buttons or other elements of
interaction). The control panel needs to be orthogonally arranged, so that widgets are
placed in a matrix of 4 rows and 4 columns. So, you need to decide which widget must
be placed at what location in the matrix.
Subtask 2.2.1: The primary consideration in placing the buttons in the matrix is the
time needed to reach (access) the widgets. This access-time depends on the distance of
the widget from the bottom left corner of the control panel. This is because the user’s
hands are assumed to be at the bottom left corner by default. The access-time required
is calculated by the position. For every individual widget, an importance parameter is
defined (based on frequency of usage of that widget). Formulate the widget layout problem in terms of an Integer Program. (Hint: Is this related to the menu-assignment
formulation?)
Some specific pairs of buttons must necessarily be NOT be adjacent to each other in
the same row. This means that for some specific pair of buttons, if one of those buttons
is in a particular row, the second button should NOT be immediately next to that widget
immediately before or after the first button in same row. However, it is permissible to
keep them on same row as long as there is some other button between them. Re-formulate the layout problem to address this requirement.
Subtask 2.2.3: Consider that a pair of buttons is strictly prohibited from being immediate neighbors: neither in same row nor in same column. How do you need to modify
the formulation?
Reminder: You should attach both a report file (PDF) and any new Python file in the submission
file (ZIP).
You are designing a control panel
like this one. But your control panel
has 16 elements to be arranged in a
matrix of 4 rows X 4 columns
This point (bottom left corner) is considered as the starting point for calculating
access time.

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