Logarithmic way of filtering sparse values..?

I have a situation where I show a matrix. The matrix contain values greater than or equal to 0. So to add convenience to the user I just added a bar slider whose minimum value is 0 and maximum value is the maximum value from the matrix. So when the user slides on the slider I just filter the matrix cells and show only those cells which have value gr开发者_如何学JAVAeater than the slider value user has slided.

My issue is that in the matrix table the values are quite sparse like there are a lot of values in the range sometime 1-5 and then 20-25 (can be other ranges also). So when i slider the tables gets reduced a lot.

I want something now that on moving the slider only a few values gets filtered. I was thinking if there is any logarithmic way of solving this problem...or may be some other way..

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If your matrix is size M x N consider storing the data in an array like data[L][2] where L = M x N and data[i][0] is the actual value while data[i][1] is the value's position in your original M x N matrix.

If data[i][0] is sorted you can process it faster to find positions with values under a given threshold.

Example:

Matrix

1 2 3
0 7 1
5 1 9

Array (value, position)

0 1 1 1 2 3 5 7 9
4 1 6 8 2 3 7 5 9

Cells with values less than 3: 4 1 6 8 2