Error: Unable to perform assignment because the left and right sides have a different number of elements. (Line 16)

Question

Andrew Williams 2018-9-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/417969-error-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-different-number-of-elem

编辑： KSSV 2018-9-7

h=0.1;
y=1;
t=0;
Tend=4;
i=1;
while(t(i)<Tend)
      t(i+1)=t(i)+h;
      slope=(5*exp(-2*t)-3*exp(-4*t))/2;
      y(i+1)=y(1)+slope*h;
end

Can anyone help me figure out whats causing the error in my code? I am trying to numerically approximate a function value from 0 to 4 seconds with a 0.1 secnd time step.

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Answer 1

KSSV 2018-9-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/417969-error-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-different-number-of-elem#answer_335828

编辑：KSSV 2018-9-7

在 MATLAB Online 中打开

You should proceed something like this:

h=0.1;
Tend=4;
t = 0:h:Tend ;
y = zeros(length(t),1) ;
y(1) = 1 ;
for i = 1:length(t)-1
      slope=(5*exp(-2*t(i))-3*exp(-4*t(i)))/2;
      y(i+1)=y(i)+slope*h;
end
plot(t,y)