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Error " Array indices must be positive integers or logical values."

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Jessica Larry
Jessica Larry 2020-4-29
评论： Jessica Larry 2020-4-29
This is the Question I am being asked to solve and this is the code I have so far...
T1 = 70; %deg F
T2 = 200; %deg F
W = 2; %ft
L = 2; %ft
x = 1; %ft
y = 1; %ft
for n=0:1.83:11
T(n)=(T2-T1)*(2/pi)*(2/n)*(sin(n*pi*x/L))*(sinh(n*pi*y/L))/sinh(n*pi*W/L)+T1;
end
I'm nor sure if my n for the for loop is correct since nmax is 11 and there needs to be six steps, but I keep getting an Error " Array indices must be positive integers or logical values."
Not sure how I can fix the Error.
  1 个评论
Rik
Rik 2020-4-29
As a side note: if your code is correct, then the only "correct and appropriate" use of a loop will be be this:
for dummy=1
T=%array operation that creates T
end

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采纳的回答

Rik
Rik 2020-4-29
You need to distinguish between the index of your variable in Matlab and the subscript in the mathematical sense.
sub=___;%hint: look at linspace
for n=1:numel(sub)
T(n)=___
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Rik
Rik 2020-4-29
If you use T(n) in Matlab that can mean two things: you are calling a function with an input argument, or you have a variable and are extracting a value from it. These two interpretations are strictly separated.
You are trying to fill an array with values. You may want to say that T has a specific value for n=0.1, but that doesn't fit either description. So you what you have to do is to create two arrays: one will hold the values of n, the other will hold the respective values of T.
T(0.1) result in an error because T is not a function. Store that 0.1 in another array and use integers to index:
sub=[0.1 0.2];
T(1)=SomeFunction(sub(1));
T(2)=SomeFunction(sub(2));
%don't do T(0.1), but do this:
T(sub==0.1)

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