i have a 2d array...W[9][9] and i want to put it a 1d array w_in1d[81]
but it gives me the wrong values
please help!
Code:/*initialize W_in1d matrix*/ for(i = 0; i < 81; i++){ W_in2d[i]=0.0; } for(k = 0; k < 81; k++){ for (i = 0; i < 9; i++) for (j = 0; j < 9; j++) W_in1d[k]=W[i][j]; } for (i = 0; i < 81; i++) { printf("%6.4lf ", W_in1d[i]); }
You've got too many loops.
Code:for(k = 0; k < 81; k++){ for (i = 0; i < 9; i++) for (j = 0; j < 9; j++) W_in1d[k]=W[i][j]; }
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
well dont you need 3 loops?
Aren't you trying to do this?
Code:#include <stdio.h> int main(void) { float b[9][9], a[(sizeof b / sizeof *b) * (sizeof *b / sizeof **b)]; size_t i, j, k = 0; for ( i = 0; i < sizeof b / sizeof *b; i++ ) { for ( j = 0; j < sizeof *b / sizeof **b; j++ ) { b[i][j] = k++; } } k = 0; for ( i = 0; i < sizeof b / sizeof *b; i++ ) { for ( j = 0; j < sizeof *b / sizeof **b; j++ ) { a[k++] = b[i][j]; } } for ( i = 0; i < sizeof a / sizeof *a; i++ ) { printf("%6.4f ", a[i]); } return 0; }
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
no i allready have values in the 2d array and i want to transfer them to an empty 1d array
Uh, that's what this is doing.
Or do you see a being assigned values somewhere that I don't?Code:k = 0; for ( i = 0; i < sizeof b / sizeof *b; i++ ) { for ( j = 0; j < sizeof *b / sizeof **b; j++ ) { a[k++] = b[i][j]; } }
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
it says
warning: comparison between signed and unsigned
and it changes the values in my array
I don't suppose you could do what I did and post your code that actually demonstrates the issue?
Oh, wait. You didn't copy and paste all of my code, you only did it part way, right?Originally Posted by sass208
Last edited by Dave_Sinkula; 12-09-2006 at 09:38 PM. Reason: Consecutive posts.
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
OK great!!!
ya i had put the first part of what u posted...i took it off and now it works !!! yay
but it still has that warning
warning: comparison between signed and unsigned
ok i fixed it up
it runs perfectly!
thank you soooooooooo much!
Uh, where? With the i,j,k? I don't suppose you used the size_t that I did, and instead used int. That would be a signed/unsigned issue.
Last edited by Dave_Sinkula; 12-09-2006 at 09:52 PM. Reason: D'oh! Pokey again. :(
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
hi man,
Hey Im new to this programming language, so dont mind if I say something wrong ok.
I think you can go with this code:
it will copy all your 2d elements to 1dCode:k=0; for (i=0;i<9;i++) { for (j=0;j<9;j++) { w_in1d[k]=w_in2d[i][j]; k++; } }
