Euler method error in code Index exceeds the number of array elements (1). in my my code
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my code
b=input('enter the starting value of b here ')
a=input('enter the starting value of a here ')
h= 15
i=600
x(1)= 0
y(1)= 0
for n=1:h:i
x(n+1)=x(n)+(a(400-x(n)))/(sqr((400-x(n))^2+(y(n)^2)))*h
y(n+1)=y(n)+(b-((a*y(n))/(sqr((400-x(n))^2+(y(n)^2)))))*h
if x <= 400
break
end
end
plot(x,y,'r')
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Fabio Freschi
2019 年 11 月 17 日
Checking the sintax of the code only I see 3 issues
1) In the for loop you wrote a(400-x(n)), that is you are addressing the position 400-x(n) = 400 when n = 1 of the variable a. but a is a scalar. so I guess you forgot an operator like, for example a*(400-x(n)) or a+(400-x(n))...
2) you are using sqr instead of sqrt to extract the square root
3) you should preallocate your vectors x and y as x = zeros(i,1); y = zeros(i,1);
Note also that using i as variable can be misleading because it is often used as index
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