how to draw tangent line simulink graph ?

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kandiban r on 26 Aug 2011
I would like to plot Tangent Line in Simulink MATLAB result . In speed vs time graph. I would like to PLOT A TANGENT LINE in
Kindly help me..
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Fangjun Jiang on 26 Aug 2011
Your question is not clear.

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Answers (1)

Chaowei Chen on 27 Aug 2011
function plot_tangent(x,y)
if nargin<2,
x=1:0.01:10;y=sin(x);
end
s=diff(y)./diff(x);
f_tangent=@(a,ind)(s(ind)*(a-x(ind))+y(ind));
x_range=[min(x) max(x)];
iscontinue=true;
plot(x,y);
[gx,gy,mouse]=ginput(1);
x_gx_diff=abs(x-gx);
ind=find(x_gx_diff==min(x_gx_diff));
hold on;
h=plot(x_range,f_tangent(x_range,ind),'r');
hold off;
iscontinue=mouse==1;
while iscontinue
[gx,gy,mouse]=ginput(1);
delete(h);
x_gx_diff=abs(x-gx);
ind=find(x_gx_diff==min(x_gx_diff));
hold on;
h=plot(x_range,f_tangent(x_range,ind),'r');
hold off;
iscontinue=mouse==1;
end
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Chaowei Chen on 27 Aug 2011
you probably can work around with and integrate this code into your simulink application.

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