help with euler code

8 次查看（过去 30 天）
Kyle
Kyle 2014-2-9
评论： Walter Roberson 2014-2-9
i wrote the following matlab( for a euler) code and i can't get it to plot, or provide a figure w. the results. can anyone help?
function [dy] = y(n,to,t,y0)
h=[0.1]
t0=0
y0=1
n=50
h=0.1
t=t0
y=y0
for i=1:n
k=2-exp(-4*t)-2*y
y=y+h*k
t=t+h
plot (t,y)
sprintf('t',' y')
end

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回答（1 个）

Walter Roberson
Walter Roberson 2014-2-9
编辑：Walter Roberson 2014-2-9
After the plot() call, add
hold on
Change your sprintf() line to
fprintf('%.14f %.14f\n', t, y);
  2 个评论
Kyle
Kyle 2014-2-9
thanks for your response. this doesn't seem to work, tho. when i plot, ( w. and w.o the code change) i'm getting a blank graph. any thoughts?
Walter Roberson
Walter Roberson 2014-2-9
If you add the "hold on" after the plot() call then the plot is not blank, but the points are not very visible. Try using
plot(t, y, 'r*')
to make the points more visible.

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