matlab give me error

function hdot = height(t,h)

hdot = -(0.0334*sqrt(h))/(10*h-h^2);

[t, h] = ode45 (@height, [0 2475], 9);

plot(t,h),xlabel('Time (sec)'),ylabel('Height (ft)')

end

[raffaele orlando]

which is the error?

[Adam]

Can't you tell us? It gives an error message I assume? That would be very useful information for anyone you are expecting to help you!

Writing a line of code like this:

plot(t,h),xlabel('Time (sec)'),ylabel('Height (ft)')

is not generally advisable though, either. It's so much easier to make a bug when you shunt 3 instructions together. Function lines don't cost money, feel free to use 3 of them for 3 instructions!

[Sriram Tadavarty]

HI Raffaele, The code doesn't seem to be right, You are calling the differential solver for height function from height function. This leads to infinte recursive calls. What do you intended with the code?

[raffaele orlando]

Not enough input arguments.

Error in altezza (line 2)

hdot = -(0.0334*sqrt(h))/(10*h-h^2);

this is the error message

[raffaele orlando]

https://it.mathworks.com/matlabcentral/answers/511154-matlab-give-me-error#comment_810720

i wanted to calculate the ode45 of hdot.

Answer 1

[Ameer Hamza]

You need to move the ode45 and plot statements out of the function. Run it like this

[t, h] = ode45 (@height, [0 2475], 9);
plot(t,h)
xlabel('Time (sec)')
ylabel('Height (ft)')

function hdot = height(t,h)
    hdot = -(0.0334*sqrt(h))/(10*h-h^2);
end