saving outputs from a loop

Question

Tanner Smith 2020-5-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524280-saving-outputs-from-a-loop

评论： Tanner Smith 2020-5-9

I would like to be able to run this program but save each ouput in the loop for both the x and the y in a matrix or array. this will find all the solutions but i don't know how to make it save each individual solution so I could graph it if I wanted to.

%matlab code for euler's method

clear all

clc

f=@(x,y)(x^2)/(1+y^2)+2*y;

x0=input('Enter initial value of x or x(0): ');%you could put x(2) here instead for this problem

y0=input('Enter initial value of y or y(0): ');%you could put y(2) here instead for this problem

xn=input('Enter the final value of x(n): '); %so 3 for this problem

h=input('Enter the step length h: '); %so h=.01

fprintf(' x y ');

while x0<=xn

fprintf('\n%4.3f %4.3f ',x0,y0);

y1=y0+h*f(x0,y0);

x1=x0+h;

x0=x1;

y0=y1;

end

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Answer 1

Ajay Kumar 2020-5-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524280-saving-outputs-from-a-loop#answer_431457

在 MATLAB Online 中打开

%matlab code for euler's method
clear all
clc
f=@(x,y)(x^2)/(1+y^2)+2*y;
x0=input('Enter initial value of x or x(0): ');%you could put x(2) here instead for this problem
y0=input('Enter initial value of y or y(0): ');%you could put y(2) here instead for this problem
xn=input('Enter the final value of x(n): '); %so 3 for this problem
h=input('Enter the step length h: '); %so h=.01
fprintf(' x      y ');
i = 1; 
while x0<=xn
    fprintf('\n%4.3f  %4.3f ',x0,y0);
    y1(i)=y0+h*f(x0,y0);
    x1(i)=x0+h;
    x0=x1(i);
    y0=y1(i);
    i = i+1;
end