Unable to perform assignment because the left and right sides have a different number of elements.

Question

suketu vaidya 2021-2-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/735862-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-different-number-of-elements

评论： Walter Roberson 2021-2-4

%euler exlicit method
h = 0.1;
x = 1:h:10;
y = [0 -1];
 for i = 1:0.1:10
 x(i+1)=h+x(i);
 y(i+1) =y(i) + h * f(x(i), y(i));
 disp(x(i+1));
 disp(y(i+1));
 end
 figure(2)
 plot(x,y);
 hold on 
function dy = f(x,y)
d=50;
x = 1:0.1:10;
c1=-1-d^2/(d^2+1);
dy=c1*exp(-d*x)+d*sin(x)/(d^2+1)+d^2*cos(x)/(d^2+1);
%analytical solution 
figure (1)
plot(x,dy);
xlabel('x');ylabel('y(x)');title('Analytical Solution');grid on
hold on 
 end

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Walter Roberson 2021-2-4

Do not assign to x inside f

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Answer 1

KSSV 2021-2-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/735862-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-different-number-of-elements#answer_614447

在 MATLAB Online 中打开

function myfunc()
%euler exlicit method
h = 0.1;
x = 1:h:10;
y = [0 -1];
for i = 1:length(x)
    x(i+1)=h+x(i);
    y(i+1) =y(i) + h * f(x(i), y(i));
    disp(x(i+1));
    disp(y(i+1));
end
figure(2)
plot(x,y);
hold on
end
function dy = f(x,y)
d=50;
% x = 1:0.1:10;
c1=-1-d^2/(d^2+1);
dy=c1*exp(-d*x)+d*sin(x)/(d^2+1)+d^2*cos(x)/(d^2+1);
%analytical solution
% figure (1)
% plot(x,dy);
% xlabel('x');ylabel('y(x)');title('Analytical Solution');grid on
% hold on
end