I don't know, what I do wrong?:'(

2011 12 28
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Hello Helpers,
I don't know what to do. Everytime I try to use funktion: slove, this errordialog appeer.
EDU>> clear all
EDU>> slove('x+2=3')
??? Undefined function or method 'slove' for input arguments of type 'char'.
May you can help me find a way... I guessed: I have not the symbolic toolbox, but I found it in C:\Program Files\MATLAB\R2010a Student\toolbox\symbolic
Backgroundinformation: I need to slove equations like this:
v=13,5 m/s (v is the speed of an shooted object)
h=1,70 m (h is the distance to the ground)
g=9,81 m/s^2 (-g is th increas in speed in direction ground)
sy(t) is the actuall distance to the ground
sx(t) is the distance in x direction
I search for sxmax and the best angle of q
sy= v * sin(q) * t + (-g/2)t^2 + h
0= v * sin(q) * tmax + (-g/2)tmax^2 + h
0= tmax^2 + (-2*v*sin(q)/g * tmax + (-2*h/g)
tmax= (v*sin(q)/g)+((v*sin(q)/g)^2+(2*h/g))^(1/2)
(p-q-formula taken without - as opinion cause tmax > 0)
sx= v * cos(q) * t
sxmax= v * cos(q) * tmax
sxmax= v * cos(q) * (v*sin(q)/g)+((v*sin(q)/g)^2+(2*h/g))^(1/2)
diff(sxmax)=0
0=diff( sxmax= v * cos(q) * (v*sin(q)/g)+((v*sin(q)/g)^2+
(2*h/g))^(1/2) )
soo... now I should get q, but I need to get the formula, and not a numeric result.. may you say me a way
sorry for my english, and thanks for reading and may helping

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Honglei Chen
Honglei Chen 2011-12-28

0 个投票

You typed slove and it should be solve

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Sascha
Sascha 2011-12-28

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-.-
that can't be I wrote it 100 times it can't be 100 the same misstake..., but thanks may it is... I will try it again. If it does not work I will ask again. Now I accept your answer for now

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