how do i dfferentiate u with respect to t?

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mi=2290000;
mf=130000;
tb=165;
t=linspace(0,165);
mr=mi-((mi-mf)*(t/tb));
hold all
g = 9.81;
Isp=263;
u=g.*(Isp.*log(mi./mr)-t);
f1=figure;
plot (t,u, 'red')
p = cumtrapz(t,u);
f2=figure;
plot(t,p, 'blue')

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Walter Roberson
Walter Roberson 2019-11-30
编辑:Walter Roberson 2019-11-30
gradient(u, t(2)-t(1))

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