Ruby Problem

def generate(baseNoise, octave)
            smoothNoise = ([[0]*@height] * @width)
            samplePeriod = 1 << octave
            sampleFrequency = 1.0 / samplePeriod
            horizontal_blend = 0
            smoothNoise.each_index  do |i|
                sample_i0 = (i / samplePeriod) * samplePeriod
                sample_i1 = (sample_i0 + samplePeriod) % @width
                horizontal_blend = (i - sample_i0) * sampleFrequency
                # puts horizontal_blend
                smoothNoise[i].each_index do |j|
                    sample_j0 = (j / samplePeriod) * samplePeriod
                    sample_j1 = (sample_j0 + samplePeriod) % @height
                    vertical_blend = ( j - sample_j0 ) * sampleFrequency

                    top = Math.interpolate(baseNoise[sample_i0][sample_j0], baseNoise[sample_i1][sample_j0], horizontal_blend)
                    bottom = Math.interpolate(baseNoise[sample_i0][sample_j1],baseNoise[sample_i1][sample_j1], horizontal_blend)
                    # smoothNoise[i][j] = Math.interpolate(top, bottom, vertical_blend)
                    smoothNoise[i][j] = horizontal_blend
                    #to this place horizontal_blend is changed and well assigned to smoothNoise
                end
            end
            #but in this place smoothNoise is all filed in last horizontal_blend value
            puts horizontal_blend
            @noise = smoothNoise
        end