Array Indice Error For Loop
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Following code is coming up with error "Array indices must be positive integers or logical values."
Does someone know what is causing this. Trying to store each value into an array
z =@(x) tan(x);
h = 0.5
for x=1:0.5:10
Output (x) = (z(x+h)-z(x-h))/(2*h);
end
Array = [Output]
1 个评论
Note that your code can be trivially vectorized (a loop is a waste of time):
z = @tan;
h = 0.5;
x = 1:0.5:10;
y = (z(x+h)-z(x-h))./(2*h);
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采纳的回答
madhan ravi
2018-10-25
编辑：madhan ravi
2018-10-25
z =@(x) tan(x);
h = 0.5
x=1:0.5:10
Output = zeros(1,19) %preallocation for speed and efficiency
for i = 1:numel(x)
Output (i) = (z(x(i)+h)-z(x(i)-h))/(2*h);
end
Array = Output
3 个评论
madhan ravi
2018-10-25
you can access x(1.5)->(second iteration) because indexing should be real integers
Stephen23
2018-10-25
@madhan ravi: where is the array preallocation? What do those square brackets do? (Hint: nothing)
madhan ravi
2018-10-25
Thank you Stephen (edited now)
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