Plot a variable with different values at different time intervals.

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Somadina F. Ezeiruaku
评论： Sean Watts 2019-3-29
Hi
I have a table below that assigns different values of r at different time interval. How can I do this please?
Screen Shot 2019-01-30 at 2.27.10 PM.png

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madhan ravi
madhan ravi 2019-1-30
编辑：madhan ravi 2019-1-30
Logical indexing is more efficient :
t=0:.001:8;
r=zeros(size(t));
r(t>=0 & t<1)=100;
r(t>=1 & t<4)=250;
r(t>=4 & t<6)=330;
r(t>=6 & t<8)=100;
r(t==8)=0;
plot(t,r)
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Sean Watts
Sean Watts 2019-3-29
Thanks for reply,
I am very new to Matlab but have to use it for a module in my civ eng degree.
I essentially need to make a modulating function (phi(t)) to apply to a larger variable.
with t=0:20 seconds and beta=9/10; t1=2.5/beta; t2=11.5/beta;
boundarys;
phi(t)= (t/t1).^2 when t<t1
phi(t)= 1 when t1=<t=<t2
phi(t)= exp(-beta*(t-t2) when t>t2

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