How to do get my code to display an answer using f print f. I want to display the result using fprint f

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This is my Code
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t_sec=[0 30 60 150 240];
Temp_C=[800 457 269 79 46];
time=0:1:250;
pa=polyfit(t_sec,Temp_C,4);
Pa=polyval(pa,time);
pb=spline(t_sec,Temp_C,time);
pc=pchip(t_sec,Temp_C,time);
plot(t_sec,Temp_C,'b*',time,Pa,'r-',time,pb,'g-',time,pc,'m-')
xlabel('Time(sec)')
ylabel('Temp(C)')
legend('Data','Polynomial interpolation','not-a-knot','shape-preserving')
t_3min=180;
T_3min=pchip(t,T,t_3min)
Unrecognized function or variable 't'.

Accepted Answer

Star Strider
Star Strider on 21 Jun 2022
Perhaps this —
t_sec=[0 30 60 150 240];
Temp_C=[800 457 269 79 46];
time=0:1:250;
pa=polyfit(t_sec,Temp_C,4);
Pa=polyval(pa,time);
pb=spline(t_sec,Temp_C,time);
pc=pchip(t_sec,Temp_C,time);
plot(t_sec,Temp_C,'b*',time,Pa,'r-',time,pb,'g-',time,pc,'m-')
xlabel('Time(sec)')
ylabel('Temp(C)')
legend('Data','Polynomial interpolation','not-a-knot','shape-preserving')
t_3min=180;
T_3min=pchip(t_sec,Temp_C,t_3min); % Guessing That This Is What Is Actually Wanted
fprintf('\nThe temperature at %3d seconds is %.3f °C\n',t_3min,T_3min)
The temperature at 180 seconds is 62.114 °C
See the documentation for fprintf for details.
.

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R2022a

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