Plots not displaying any information

I Have this code where i'm trying to make 2 different plots in respect to one of the variables but when i run the code i get no errors and the plots appear but are empty. Not sure what im doing wrong. Using the Aerospace add on

Mdot=2624;
Ve=2580.87;
Pe=50;
Ae=43.008;
Go=9.81;
Pinf=101.3:0.000032;

Alt= atmospalt(Pinf);
F=Mdot * Ve + (Pe-Pinf)*Ae;

Isp=F/(Go*Mdot);

figure
title('Thust vs. Alt')
xlabel('Alt')
ylabel('Thrust')
plot(F,Alt);
hold on

figure
title('Isp vs. Alt')
xlabel('Alt')
ylabel('Isp')
plot(Isp,Alt);hold on

Answer 1

[Voss]

Pinf is empty

Pinf=101.3:0.000032

Pinf =

  1×0 empty double row vector

so Alt, F, and Isp are also empty; therefore the plots are empty.

What is the intended value of Pinf?

[Michael Howard]

Pinf is supposed to be the air pressure at sea level (101.3 KPa) to the pressure at an altitude of 100000 m (3.19*10^-5 KPa)

[Torsten]

Then you must interchange the two limits:

Pinf=0.000032:101.3

Or better use

Pinf = linspace(0.000032,101.3,100)

[Michael Howard]

Thank you that seamed to work