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Error:Subscript indices must either be real positive integers or logicals
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I am fairly new to MATLAB and I am still learning the tricks to it. In this program I am trying to make, I want the program to calculate average power in two separate (but similar in design) AC circuits with 2 impedance and then plot these average power values vs. x. One impedance is a variable impedance where one impedance has its phase (x) varying from -50 degrees to 50 degrees and the other circuit contains the complex conjugate of this variable impedance. To keep these 2 circuits separate, I defined 2 different average power values to be calculated,(Pavg1 and Pavg2). I defined x to be a range from -50 to 50 with increments at 0.01. When I run my program, I get the error seen above and I am not certain as to why. Below is my code:
x = -50:0.01:50;
Zs = 20 + (20i);
Z01(x) = 20 + (x*1i);
Z02(x) = 20 - (x*1i);
Ztotal1(x) = Zs + Z01;
Ztotal2(x) = Zs + Z02;
I1(x) = 240/Ztotal1;
I2(x) = 240/Ztotal2;
Pavg1(x) = (240*I1(x))/2;
Pavg2(x) = (240*I2(x))/2;
Plot(x,Pavg1(x));
Plot(x,Pavg2(x))
And MATLAB says that my error is on Line 3 (Z01(x)).
Any help for a semi-beginner to MATLAB is appreciated. Thank you ahead of time for any help.
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Answers (2)
Iain
on 22 Sep 2014
Edited: Iain
on 22 Sep 2014
The simple answer, which should work is to drop all of the (x) you've got.
The reason being that it looks like you're confusing a "function" with a "vector".
To define a function, on the fly:
Z01 = @(x) (20+x*i); %The second load of () are optional, but I find they make it clearer.
Z01(-5.45641) will then give you an answer
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