adding 2d arrays together

Programming Questions

akeetekt

in Programming Questions • 2 years ago

hi guys,

i have a set of 2d arrays which i've stored in an arraylist. How do i combine the 2d arrays?

the script is a bit lengthy so i dont want to post the whole thing up...

Copy code

//xs is the int[][] arraylist
//finalSum is a variable stored in the class
for(int i=0;i<xs.size();i++){
int valval[][] = new int[imgwidth][imgheight];
valval = xs.get(i);
for(int j=0;j<imgwidth;j++){
for(int k=0;k<imgheight;k++){
finalSum[j][k] = finalSum[j][k] + valval[j][k];
}
}
}

Replies(3)

akeetekt

Re: adding 2d arrays together

2 years ago

hi guys i'm still pretty stuck, what is the best way of combining 2d arrays?

eg:

array1 {[1,0,0],

[0,1,0],

[0,0,1]}

array2 {[1,0,0],

[0,1,0],

[0,0,1]}

array1 + array 2 = {[2,0,0],

[0,2,0],

[0,0,2]}

PhiLho

Re: adding 2d arrays together

2 years ago

You create an array then drop it. Just declare it:

Copy code

for(int i=0;i<xs.size();i++){
int valval[][] = xs.get(i);
for(int j=0;j<imgwidth;j++){
for(int k=0;k<imgheight;k++){
finalSum[j][k] += valval[j][k];
}
}
}

What is wrong with that? (I made minor improvements, not changed the result.)

akeetekt

Re: adding 2d arrays together

2 years ago

thanks phi, seems to be solved. I needed to store each value in a class for it to work.

i seem to be having some out of memory issues now though. I ended up storing this in a function within a class

do you have any advice on which parts could be only called once? i seem to be getting an out of memory issue. apologies for the toxilibs Vec3D library in this part of the forum.

Copy code

class agentInput {
//input agent
//output value[][] with mod
Vec3D pos;
int outputNest[][] = new int[imgwidth][imgheight];
int updateVal[][]=new int[imgwidth][imgheight];
agentInput(Vec3D _pos) {
pos = _pos;
}
void softSelect() {
for (int x=0;x<imgwidth;x++) {
for (int y=0;y<imgheight;y++) {
Vec3D otherPoints = new Vec3D(x, y, pos.z);
float distance = pos.distanceTo(otherPoints);
if (distance>1 && distance <20) {
outputNest[int(otherPoints.x)][int(otherPoints.y)] = int(30*gridSize/pow(distance, 2));
}
}
}
}
int[][] outputNest(int output[][]) {
for (int x=0;x<imgwidth;x++) {
for (int y=0;y<imgheight;y++) {
output[x][y] = outputNest[x][y];
}
}
return output;
}
int[][] combineNest(int sum1[][], int result[][]){
for(int i=0;i<imgwidth;i++){
for(int j=0;j<imgheight;j++){
result[i][j]+=sum1[i][j];
}
}
return result;
}
}

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