I can't do this
varhistArray=newArray(256);
varhistData = [histArray,histArray,histArray];
for(i=0;i<3;i++){
for(j=0;j<256;j++){
histData[i][j] = 0;
}
}
This one will be initialized properly, but why is this?
varhistData=[histArray,histArray,histArray];
for(j=0;j<3;j++){
histData[j] = new Array(256);
for(i=0;i<256;i++){
histData[j][i] = 0;
}
}
varhistData=[histArray,histArray,histArray];
There is only one instance of histArray, so it's always
histData[0][n]==histData[1][n]==histData[2][n]==histArray[n]
That's what happens.For example, if histData[0][1] is substituted for histData[1][1] and histData[2] [1] and histArray[1] will be the same value (because they all point to the same instance).
Therefore, you need to initialize as follows:
varhistData=[newArray(256), newArray(256), newArray(256)];
In the first code example, histData[0], histData[1], histData[2] all point to the same container.Therefore, it would be strange to try to use histData[n][m] initialized in the first code example.
In the second code example, new Array(256) on the third line provides a new container, so histData[0], histData[1], histData[2] all refer to different containers.So you will be able to use it the way you want.
JavaScript 1.7 has a convenient array.
function range (begin, end) {
for(leti=begin;i<end;i++){
yieldi;
}
}
varhistData = [[0 for each(jin range(0,256))] for each(i in range(0,3));
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