Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/explanation.mw .
 

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by the way, remember than initial condition is Q(0)=0. i have solved the same problem in the same way, using the same 5 ecuations (the first ones), but taking h__1 and h__2 like constants values. i got an answer back then, dont know why it doesn't work now.

@tomleslie 

@tomleslie actually maple recognize itself the unknows. it recognize Q(t),T_1s(t),T_1(t),T_2s(t) and T_2(t) like the unknows. they have the form a(t)...they are functions of time.  but any way, if you need numeric values, they are A=0.01375, T_1i=80,T_2i=22.5,c_p=4190,d=0.001,g=9.8,h=0.11,m_1=m_2=1.375 and if im right, there is no any h_2, that was a mistake there. I have corrected it. So the matter is, i want numerically solved that sort of 5 ecuations, don't matter if those are 5 diff ecuations or 3 diff ecuations with 2 algebraic ecuations.   

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/explanation.mw .
 

Download explanation.mw

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/explanation.mw .
 

Download explanation.mw

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/explanation.mw .
 

Download explanation.mw

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/explanation.mw .
 

Download explanation.mw

ok, i uploaded a new document, which maple primes can't load to worksheet for some reason, thats the problem itself, i think it's clear what i did. i solved the dif ecuation using right click over expression, then "solve interactively", it shows a window where you can assingn values to your parameters, then solve it numerically. i tried to upload a print screen but for some reason the webpage doesn't allow me to do.

Download proyectil_multivariable.mwproyectil_multivariable.mw

@tomleslie if i use fsolve(distancia-300,initial point) get an aswer, but if i try with fsolve(distancia=300,initial point), which i think is the same, it just return the input. Another thing is fsolve(yprueba,initial point) doesn't works, but fsolve(yprueba(t)=0,t,avoid...) perfectly works, while fsolve(distancia(a)=300, a, initial point) doesn't return nothing, why maple is so crazy sometimes?

@tomleslie although basically that i was looking for, and that my excel small or very simple code can do is take an initial point, evaluate that point, and through an if code, a slop definition formula and an absolute value formula get closer and closer to solution, obviously with a precision previously specified by user. It's not very stable since can give you values from 10^-13 on precision during one iteration, and give you 10^-7 on next iteration, but supposing you chose something like 10^-7 by precision. It just need to be capable to evaluate the expression(get an argument, then a value for that argument), just like maple can evaluate distancia. So, i supposed: if i did it using a simple excel document, maple must have gotten something much better. wouldn't you suppose the same? 

@tomleslie i have to say i didn't know fsolve solves ONLY for a 0 value, does it? If thats the case, dont know why maple is not stronger on numeric solutions, which are most of times the only possible solution. And respect to the proc, im looking for something more simple than the solution acer planted in the second answer. so im guessing maple could have a simple iterative method that could solve it, using only test and fail, like that method i developed on my excel 2013, knowing nothing about programmation or codes, with the function if. That's why im guessing...   

@acer in the second answer, you did a kind of inverse function to distancia, and used a procedure(which i didn't get), and various strange commands i don't know what they are used for. you also used an fsolve on it, and although i know the command fsolve, i didn't understand how you used it this time, even i could say it doesn't look like anything on maple help page about fsolve.

So i'm wondering if it's possible to find an inverse function for distancia on a more simple way, starting from the first answer you did, which i perfectly understood, maybe using a simple command and not a procedure, like i did originally with yprueba(t), for which i used fsolve. I think maple must have a command which evaluate the results gotten with a function through several points, and find that point that adjust to an specific value for distancia: an iterative method, doesn't matter if it takes a while, like with distancia's plot on your first answer.

@acer  thanks for the time you wasted trying to explain me the way to typing a code like this correctly, thanks for share your knowledge and obviously for solving my problem.

thanks to both of you :)

@tomleslie hey thank you tom, i apreciate your help so much, because it was a not so simple problem to solve, and you continued to trying help me. And thank you for solving the numered questions i asked too. 

@tomleslie i would like to know also if it's possible to the function distancia to return the angle value form a given distance, using this strange command UseHardwareFloats, i have not tried yet.

@tomleslie he restricted the launch angle, he did it from 0 to Pi/2

@acer ok, im not a programmer, so i would like to know a sort of things you did i didn't understand.

1. i would like to know how do you go down without clicking enter while you are typing a code, i think it's shift + enter, but im not sure.

2. why are you typing local t before work with a t value?

3. To replace the parameters value why i need to put ':-word'?, maybe indicating that "word" belongs to yprueba?

4. If i want to declare more than a single parameter, i have to type:  parameters=[theta,a,b,c] on sol, when declaring desolve, for example? 

5. And for last, what is Hardware Floats?

@acer finally, thanks man!!, i really wanted to solved it!! I love maple, i really want to learn how to use it, so in my universoty or college they believe computers doesn't exist, and evaluate you like you were the computer😂😂😂

@tomleslie i just posted it again with various tags, so maybe someone knows a way to Maximize that expression. I think maple should try harder with numeric solutions, because most of usefull DE solutions for industry, science and technology can't be solved analitically, rather numerically, so it would be great if it was the same or even more simple to solve and manipulate a numerical DE solution.