module CsrMatrix::Helpers
Public Instance Methods
count_nonzero(array)
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# File lib/csrmatrix/helpers.rb, line 42 def count_nonzero(array) # Finds all nonzero values in an array. # pre array # post int nonzero count of array max_count = 0 array.each_index do |i| subarray = array[i] subarray.each_index do |x| if array[i][x] != 0 max_count += 1 end end end return max_count end
count_total(array)
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# File lib/csrmatrix/helpers.rb, line 74 def count_total(array) # Counts all elements in array - assumed 2d # pre array # post int count of all elements max_count = 0 array.each_index do |i| subarray = array[i] subarray.each_index do |x| max_count += 1 end end return max_count end
depth(array)
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# File lib/csrmatrix/helpers.rb, line 58 def depth(array) # Code from http://stackoverflow.com/questions/9545613/getting-dimension-of-multidimensional-array-in-ruby # Identifies the depth of an array. # pre array # post int depth of array return 0 if array.class != Array result = 1 array.each do |sub_a| if sub_a.class == Array dim = depth(sub_a) result = dim + 1 if dim + 1 > result end end return result end
max_col(array)
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ARRAY FUNCTIONS for pre-processing of matrix
# File lib/csrmatrix/helpers.rb, line 9 def max_col(array) # Identifies the 'column' value of an array (eg. the number of entries in a column) # pre array # post column count of array values = array max_count = 0 # Loop over indexes. values.each_index do |i| counter = 0 # Get subarray and loop over its indexes also. subarray = values[i] subarray.each_index do |x| counter += 1 end if counter > max_count max_count = counter end end return max_count end
max_row(array)
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# File lib/csrmatrix/helpers.rb, line 30 def max_row(array) # Identifies the 'row' value of an array (eg. the number of entries in a row) # pre array # post row count of array values = array max_count = 0 values.each_index do |i| max_count += 1 end return max_count end