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40 lines
844 B
Plaintext
40 lines
844 B
Plaintext
NAME
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swap - swap values of two variables
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SYNOPSIS
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swap(x,y)
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TYPES
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x, y lvalues, any type
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return null value
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DESCRIPTION
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swap(x,y) assigns the value of x to a temporary location, temp say,
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assigns the value of x to y, and then assigns the value at temp to y.
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swap(x,y) should not be used if the current value of one of the
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variables is a component of the value of the other; for example, after:
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A = list(1,2,3); swap(A, A[[1]]);
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A will have the value 2, but a three-member list remains in memory
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with no method within calc of recalling the list or freeing the
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memory used.
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EXAMPLE
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> x = 3/4; y = "abc"; print x, y, swap(x,y), x, y
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.75 abc abc .75
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> A = list(1,2,3); mat B[3] = {4,5,6}; swap(A[[1]], B[1]); print A[[1]], B[1]
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5 2
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LIMITS
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none
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LIBRARY
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none
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SEE ALSO
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assign
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