Summation using For Loop
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I have to solve the equation for 'a'.
Now x are the elements in the following array:
x=[0.56746089 0.60481729 0.622521 0.53714241 0.60310756 1.07806689 1.19968209 1.05637284 1.14618436 0.94031809];
My problem is that I do not know how to call the elements in the array in a function.
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Brian Voke
2021-5-10
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To call a specific element from an array or matrix you can use this notation: for matrix x the first element would be x(1), the second element would be x(2) and so on. If you're just trying to find the solution to that equation where each element in a corresponds to a solution with a single element in x then you can write the equation using element wise operators to multiply matrices element wise the operator is preceded with period. (So a times x would be written as a .*x). Then you could solve the equation using the solve function.
6 个评论
J.Cam
2021-5-10
Brian Voke
2021-5-10
I'm not sure exactly how you'd format this to work, but I believe your current error is that your trying to use symsum to sum the variable i, but you do not have i as a symbolic variable. Including i as a symbolic variable is a step in the right direction, but I think you may have to look more into the inputs and setup for symsum before you'll get this working right.
J.Cam
2021-5-10
Brian Voke
2021-5-10
I would double check to make sure I didn't mess up any parantheses but I think this is a solution. This works because there's only 10 elements in the x matrix so it's not like you need to specify which elements you want to run then sum. The elementwise multiplication makes it so that the resulting m matrix has 10 elements each corresponding to an element in x. So the normal sum function should work.
x=[0.7569
0.69956496
0.60109009
0.67519089
0.14676561
0.72607441
0.65302561
0.40106889
0.71284249
0.69022864];
syms a
m=(x.*cos(a.*(x))./(sin(a.*x)));
ms=sum(m);
ftn = 10/a + ms;
value=vpasolve(ftn==0,a)
J.Cam
2021-5-10
Brian Voke
2021-5-10
No problemo
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