When ploting the multi array can one use the RC-convention method Xsubscript (row,column) like on
and I wanted to say the value of 5 would be at arraytest[3][1] or would I say arraytest 3,1. How could I tell presay a user 5 is at X (and no not the coding, I can do that). In theory I have talked to my Math teacher about matrix's and noticed that it was just a mulit-d-array.Code:arraytest[2][4] [1][2] [3][4] [5][6] [7][8]
this is how i would go.
no 5 is located at row no 3 at col 1
ssharish2005
ok when making an array the first [x] represents amount in the row the second [x] represents columns. Like dan[4][2]
Code:[1] [2] [3] [4] *i assume this is correct [5] [6] [7] [8] or [1] [2] [3] [4] [5] [6] [7] [8]
dan[i] is array containing 2 elements
Code:{{0,1},{2,3},{4,5},{6,7}}
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler
so vert dan[i][x] i is the value of how many group of rows are and [x] declares how many elements/spaces are in a single row
Array of Dan containing 3 elements, i will truly only decide how many in theory how many rows there will be.Code:i x[][][] [][][] [][][] [][][] so this would be dan[i][3]?
so i is the L and x is the W. L*W is size of array.
Last edited by KoG Metalgod; 12-06-2006 at 07:29 AM.
I don't undestand what do you mean
int array[4][7]
declares array of 4 elemets
each elemet (array[0], array[1], array[2] and array[3]) is also array containing 7 ints
so array[2][5] is the 6th element of the 3rd array (indexes are zero based)
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler
rows and columns would be somthing you have acheived with the placment of data in the arrays,
and the way in which that data is accessed. As vart is saying, there really is no rows or columns
if you were to look at this in memory it would just be 1 "column". You specify by the algorithms you use, what represents a row and what represents a column.
for example
output:Code:#include <stdio.h> int main(void) { int i, j; int ary[3][5] = { {1, 2, 3, 4, 5}, {1, 2, 3, 4, 5}, {1, 2, 3, 4, 5} }; for (i = 0; i < 3; i++) { for (j = 0; j < 5; j++) printf("%d ", ary[i][j]); printf("\n"); } for (i = 0; i < 5; i++) { for (j = 0; j < 3; j++) printf("%d ", ary[j][i]); printf("\n"); } return 0; }
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
so which for loop is representing data in the correct row/column's? That depends on what way other code in the program, uses and "sees" the data. It could be either, its up to you, it just has to be consistant
output:Code:#include <stdio.h> int main(void) { int i, j; int ary[3][5] = { {1, 2, 3, 4, 5}, {1, 2, 3, 4, 5}, {1, 2, 3, 4, 5} }; int *ptr = &ary[0][0]; for (i = 0; i < 15; i++) printf("%d\n", *ptr++); return 0; }
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
or maybe even though you've used a 2 dimensional array (which is not needed in this case), you just want it to have 1 "colunm" or "row".
