the acos funtion will not accept negagive numbers (e.g. -075) . WHY?

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Timothy Goldsmith
评论： Timothy Goldsmith 2017-3-7
>> x = -1:.05:1;
plot(x,acos(x))
grid on
Subscript indices must either be real positive integers or logicals.

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Walter Roberson
Walter Roberson 2017-3-6
You have either defined a variable named "acos" or a variable named "plot"

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