SEARCH

SEARCH A, key, BYREF idx [USE cmpfunc( var1, var2)]

Scans an array A for the key key and returns the position idx of the element. If the key is not found idx contains the value (LBOUND(A)-1). In default-base arrays (starting with element zero) -1 will be returned.

The optional compare function cmpfunc takes 2 vars var1 and var2. var1 contains the value of the actuell element and var2 is equal to key. The compare function must return 0 or 1 (false or true). When it returns 1, the search will stop and the current element position is returned in idx.

Example 1: 1D array of numbers

option base 1

A = [1,9,6,4,5,3,7,8,2]         ' 1D array with 9 elements
SEARCH A, 3, ElementID          
print "Element: "; ElementID    ' Output: Element: 6

Example 2: 2D array of numbers

option base 1

A = [1,9,6;4,5,3;7,8,2]         ' 2D matrix with 3x3 elements
SEARCH A, 3, ElementID
print "Element: "; ElementID    ' Output: Element: 6

Example 3: Get the element position of the maximum value of an 1D array

option base 1

A = [1,9,6,4,5,3,7,8,2]
m = max(A)
SEARCH A, m, ElementID
PRINT "Element: "; ElementID    ' Output: Element: 2

Example 4: 1D array of strings

option base 1

A = ["car", "dog", "house", "paper"]
SEARCH A, "house", ElementID
PRINT "Element: "; ElementID        ' Output: Element: 3

Example 5: Compare function, find first element greater than the key

option base 1

func findgreater(x,y)
    findgreater = !(x > y)
end

A = [1,2,3,4,5,6,7,8,9]
search A, 5, ElementID USE findgreater(x,y)
PRINT "Element: "; ElementID         ' Output: Element: 6

Example 6: Compare function, find first element which can be divided by the key

option base 1

func FindFirstDivider(x,y)
    FindFirstDivider = ( (x mod y) > 0 )
end

A = [1,5,7,4,5,6,7,8,9]
search A, 3, ElementID USE FindFirstDivider(x,y)
PRINT "Element: "; ElementID         ' Output: Element: 6

Example 7: Compare function, find first element with string length given by the key

func FindFirstStringWithLenght(x,y)
    FindFirstStringWithLenght = ( len(x) != y )
end

A = ["car", "dog", "house", "paper"]
SEARCH A, 5, ElementID use FindFirstStringWithLenght(x,y)
PRINT "Element: "; elementID          ' Output: Element: 3

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