when i do my code for v>0 on my while loop it's a neverending loop and i dont know why if i do it for i<30 for 30 iterations i get a height of 50784 but should be right around 205.7 any ideas how to stop it from entering an ifinite loop on v>0 and a

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Mitchell McKinney 2020-10-27

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https://ww2.mathworks.cn/matlabcentral/answers/628278-when-i-do-my-code-for-v-0-on-my-while-loop-it-s-a-neverending-loop-and-i-dont-know-why-if-i-do-it-fo

关闭： MATLAB Answer Bot 2021-8-20

clear;
h=60          %stepsize
hof=240                         %inches in water
dtank=120                       %diameter of tank in inches
dnozzle=1.049                   %diameter of nozzle in inches
areanozzle=((dnozzle^2)*pi)/4   %area of nozzle
areaoftank=((dtank^2)*pi)/4     %area of tank
v=areaoftank*hof                %initial volume of water in tank
c=.6                            %tank discharge coefficiant
g=386.088                       %force of gravity
b=dnozzle/dtank                  %beta
baseball=-areanozzle*c*(sqrt((2*g)/((1-b^4)*(areaoftank))))
 F =@(x,y) (x * sqrt(y));            %function
i=0
while i<30
    i=i+1;
    k1=F(baseball,v)
    k2=F(baseball + .5*h,v + .5*h*k1)
    k3=F(baseball + .5*h,v + .5*h*k2)
    k4=F(baseball + .5*h,v + h*k3)
    
    v=v+ (1/6) *(k1 + 2*k2 + 2*k3 + k4)*h
    if v<0
        break
    end
end
v
seconds=i*h/60
height=v/areaoftank

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Answer 1

Cris LaPierre 2020-10-27

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编辑：Cris LaPierre 2020-10-27

It's infinite because your condintion, v>0, would always be true.

Programming-wise, your code does not create an error. That means you should make sure you have properly implemented your equations and algorithms correctly.