C# Discussion Boards - CodeProject

4-Jul-05 7:40

I want to define a class (which will store a 2D matrix and will do some operations on that).

Say I want to define a 2D matirx [1 2 3 ;1 2 3; 3 4 5] and I have a GUI to enter the data, where I enter <big>matrix(1,2,3;1,2,3;3,4,5)</big> and it constructs the matrix [1 2 3 ;1 2 3; 3 4 5].

Can someone help me how to acheive this?

S. Senthil Kumar4-Jul-05 7:55

S. Senthil Kumar

4-Jul-05 7:55

Maybe you can do something like

new Matrix(
   new MatrixRow(1, 2, 3),
   new MatrixRow(1, 2, 3),
   new MatrixRow(3, 4, 5)
   );

Does that help?

Regards
Senthil
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Guffa4-Jul-05 8:00

4-Jul-05 8:00

To store a two dimensional array, you use an array of arrays.

int[][] matrix;<br />
matrix = new int[3][];<br />
for (int i=0; i<3; i++) matrix[i] = new int[3];

Now you have a 3x3 array that you can store the values in.

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amitmohanty4-Jul-05 8:05

4-Jul-05 8:05

But only problem is that i don't know what will be the size of the mastirx before hand. I just gave u an example ,..it could be any n*m matrix.

Guffa4-Jul-05 8:28

4-Jul-05 8:28

You can replace the numbers with variables containing any number you want.

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amitmohanty4-Jul-05 8:43

4-Jul-05 8:43

Have you worked in MATLAB? its like nothing is mentioned? you just enter

>>[1 2 3,4 5 6;8 9 6]

and it creates a matrix. i want some application lik ethat. by looking at the expression user entered you construct the matrix. i know we can do that by defiing a variable. but how to determine th eorder of the matrix (n*m) by looking at the expression. bec as far as i know constructor takes only parameters. trick here is that by looking at the string 1 2 3,4 5 6;8 9 6 your constructor should be able to say that it is a 3*3 matrix and defines the matrix accordingly

Guffa4-Jul-05 10:27

4-Jul-05 10:27

Split the string by semicolon:

string input = "1 2 3;4 5 6;7 8 9";<br />
string[] rows = input.Split(';');

Now you have an array with three records. Create an array of string arrays to store the final result:

string[][] matrix = new string[rows.Length][];

Now split each row by space to get an array, and put it in the matrix:

for (int i=0; i<rows.Length; i++) matrix[i] = rows[i].Split(' ');

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amitmohanty4-Jul-05 11:06

4-Jul-05 11:06

Thanks..solves my problem. u exactly got into the root of the problem.

Guffa4-Jul-05 11:32

4-Jul-05 11:32

Note though that the code does not check if the matrix is square. It will happily turn a string like "1;2 3 4 5;;6;7;8 9" into arrays without complaining.

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Windows Forms Question

1nsp1r3d4-Jul-05 6:00

1nsp1r3d

4-Jul-05 6:00

Hi all,
I've started coding a windows form without the designer and suddenly I needed to set one of this property. Then I took a look at the code and saw that the designer added a function InitializeComponent() and did the setting of the property there. Couldn't the property be set in the Form's constructor? And where can I find some docs on InitializeComponent() cause I looked at MSDN and couldn't find any. Any advice is greatly appreciated.

Regards

User 66584-Jul-05 6:27

User 6658

4-Jul-05 6:27

Of course you can set the properties in the constructor. I bet the VS designer just creates an "InitializeComponents" method so it can better keep track of the changes made directly through the designer.
That's why the designer can get confused if you modify the "InitializeComponents" section too much.

regards

modified 12-Sep-18 21:01pm.

1nsp1r3d4-Jul-05 6:46

1nsp1r3d

4-Jul-05 6:46

But is this function automatically called? Because I cannot see any point where it is called.

User 66584-Jul-05 6:59

User 6658

4-Jul-05 6:59

Take a closer look at the Form() constructor Wink | ;)

modified 12-Sep-18 21:01pm.

heavenamour4-Jul-05 19:56

heavenamour

4-Jul-05 19:56

Hello Dear...
InitializeComponent() Is not a special thing ! This is a common function. It will call in Constructor.You can move all codes in this function to the constructor directely ! But You can't change this codes in designer ! Designer (VS.NET) Protects this portion of codes.If you change some codes in this area,Designer will reproduce theme at each rebuild.
I hope this was helpful for you,
Bye

how to store sender object in an array ?

Anonymous5-Jul-05 0:08

Anonymous

5-Jul-05 0:08

Thanks a lot Cool | :cool:

fracalifa4-Jul-05 5:00

fracalifa

4-Jul-05 5:00

Hi all,
I want to save the sender (object) or the information comming from th controls into an array. How to do that ?

object arr = new object[100];

void xyz_method (object sender, System.EventArgs e)
{
arr[i] = sender; // that didn't work
}

Thank's

regards
Frank

Re: how to store sender object in an array ?

Guffa4-Jul-05 5:32