if loop error in MALAB

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i am using the following if loop but it is not executing:
n=[]
if n==[]
sprintf('a')
end
it dose not print 'a'
  2 个评论
ali hassan
ali hassan 2022-2-2
编辑:ali hassan 2022-2-2
but why it is not working that way?@James Tursa
Steven Lord
Steven Lord 2022-2-2
From the documentation page: "if expression, statements, end evaluates an expression, and executes a group of statements when the expression is true. An expression is true when its result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false."
Is your expression nonempty and does it contain only nonzero elements?
n = [];
n == []
ans = 0×0 empty logical array
Your expression is empty so the statements inside the if block are not executed.
If you look at the suggestion from James Tursa:
isempty(n)
ans = logical
1
This is nonempty and it contains only nonzero elements. Therefore the if statement's expression is true and so the statements inside the if block are executed.

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采纳的回答

James Tursa
James Tursa 2022-2-2
Change your test to
if isempty(n)

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