Help Counting Elements in an Array

[sammells]

hey guys if i have a data file called "data" for instance. which had 15 cols and 15 rows. if each cell had a number assigned to it (1,0,-1) and i wanted to count how many 1's, 0's and -1's are in each respective column and row, how would i go about it?

cheers

[sana.iitkgp]

First you should try. If you find any difficulties, you need to ask here.

[sammells]

Ok so this is what i have done so far. Please notify if you see any errors

/*Declare Variables*/
/* Stores the counts FOR each row FOR 1, 0 and -1 */
float RowCounts[MAX_ROWS][MAX_COUNTS];
/* Stores the counts FOR each col FOR 1, 0 and -1 */
float ColCounts[MAX_ROWS][MAX_COUNTS];

/*Declare Constants*/
/* Data symbols */
#define MIN_SYM  -1
#define MAX_SYM  1
#define MIDDLE_SYM  0
/* Use to reference the counts */
#define MIN_SYM_INDEX  0
#define MAX_SYM_INDEX  1
#define MIDDLE_SYM_INDEX  2
#define MAX_COUNTS  3

for(row = 0; row < MAX_ROWS; row++)
    {
        for(col = 0; col < MAX_COLS; col++)
        {
            if(Data[row][col] == MIN_SYM)
            {
                RowCounts[row][MIN_SYM_INDEX] = (RowCounts[row][MIN_SYM_INDEX] +1);
            }
            else if (Data[row][col] == MAX_SYM)
            {
                RowCounts[row][MAX_SYM_INDEX] = (RowCounts[row][MAX_SYM_INDEX] +1);
            }
            else
            {
                RowCounts[row][MIDDLE_SYM_INDEX] = (RowCounts[row][MIDDLE_SYM_INDEX] +1);
            }
        }
    }

[laserlight]

This sounds similiar to a question that you already posed. Okay, so maybe you want to restart from scratch. My take:

Read from file into a 2D array of integers. Let's name this array input.
Create number_of_rows arrays of 3 arrays of integers for the row_counts, zero initialising the elements.
Create number_of_columns arrays of 3 arrays of integers for the column_counts, zero initialising the elements.
For each row
    For each column in the current row
        Let x = 0, 1, or 2 if input[row][column] is 1, 0, -1, respectively.
        Increment row_counts[row][x]
        Increment column_counts[column][x]

[Matticus]

If you have no idea how to go about this, then I would suggest breaking up this task into several smaller steps.

It might be best to start with a variable in the program that contains the "data" and work on counting the occurrences. You can make a function to handle this, and test it with "main()".

When you have that part working, write more code (preferably in its own function) to read values from a data file.

When that works, just take the data you get reading the file and plug it into the first function you wrote.

Break the task up into smaller pieces and just focus on one at a time. As you get each one fully working, you can start to string them together to make your final program.