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I don't understand my exercise

Posted on 2003-10-23
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Last Modified: 2010-04-16
My exercises is:

Make matrix operations : addition, subtraction, multiplication and division. You may limit the maximum dimension of the matrix.

what does thaht mean, i have to use array(s)
but i just don't understand the question
could someone help me ??
thanks in advance

Louis
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Question by:Louis_DePage
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Author Comment

by:Louis_DePage
ID: 9608035
don't give me any code
just a hint
a translation to normal english
thanks
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Expert Comment

by:mlmcc
ID: 9611902
Do you know what a Matrix is (not the movie) but in mathematical terms?

What Pascal data structure does a matrix look like?

How do you add one matrix to another?

Your best bet is the next day in class, get your hand in the air and ask questions.  Get your instructor to explain the assignment.
If you ask the right questions he might even do one of the parts for you.

mlmcc
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Author Comment

by:Louis_DePage
ID: 9613710
well it's not an class assignment or something in a group it's just a exercise i found on the web
and no i don't know what it is about;
could you brievely explain my what a matrix is ???
or what i should know to solve tis problem
thanks in advance

Louis
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Expert Comment

by:mlmcc
ID: 9614152
A matrix is a mathematical entity that is useful in solving a variety of problems.  Is has rows and columns of numbers

  2    2
  3    4

This is  a 2x2 matrix


Adding is done by elements

  a  b           e  f         a+e   b+f
  c  d    +     g  h   =   c+g   d+h


Subtracting is similar.

mlmcc
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Expert Comment

by:mlmcc
ID: 9614219
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Author Comment

by:Louis_DePage
ID: 9615509
okay now I know what matrices is all about
i know how to do the matrix operations
but which numbers should i place in my matrix and with what for matrix should i do the matrix operations ???
is the choice of the matrixes op to me ?
i know perfectely how to play around with arrays and so on
just which matrix should i take in this exercises ???

thanks
louis
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Author Comment

by:Louis_DePage
ID: 9615540
should i ask the user the matrixes he wants ?
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Accepted Solution

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mlmcc earned 80 total points
ID: 9618526
I would start with several small matrices (hardcode them in the application) and get the code for adding and subtracting working, then work on multiplication by a scalar then multiply 2 matrices.

After that is working, you could develop code to read in a matrix.

The main reason for doing it this way is entering the data for a matrix takes time and bad input could lead to thinking the code is wrong.

Start  with a 2x2 matrix like


  1  2        1  2      2  4
  3  4        3  4      6  8

mlmcc
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Expert Comment

by:mlmcc
ID: 9619451
Glad I could help

mlmcc
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