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See the recommended documentation of this function
if then else
conditional execution
Calling Sequence
if expr1 then statements elseif expri then statements .... else statements end
Description
The if statement evaluates a logical expression and executes a group
of statements when the expression is true.
The expri are expressions with numeric or boolean
values. If expri are matrix valued the condition is true only if
all matrix entries are true or different from zero.
The optional elseif and else provide for the
execution of alternate groups of statements. An end keyword,
which matches the if, terminates the last group of
statements. The line structure given above is not significant, the
only constraint is that each then keyword must be on the same
line as its corresponding if or elseif keyword.
The keyword then can be replaced by a carriage return or a
comma.
Warning: the number of characters used to define the body of any conditionnal instruction (if while for or select/case) must be limited to 16k.
Examples
i=2 for j = 1:3, if i == j then a(i,j) = 2; elseif abs(i-j) == 1 then a(i,j) = -1; else a(i,j) = 0; end, end
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