Looking to Solve these equations using matlab

2017 3 10
1 个回答
更新时间：2017 3 15
3 次查看（30 天）

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Hi, I am looking to recreate this code in matlab. I need to solve these equations to obtain the answers to T1-T10 and hr1-hr10. I have tried a big solve function and that has not worked. Can anyone point me in the right direction? Thanks

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John D'Errico
John D'Errico 2017-3-10
You will never solve this system of equations in the form of an analytical solution, thus in terms of radicals. So using solve is a waste of time. Sorry.
Use fsolve or vpasolve. We won't write the code for you though. In any case, you effectively have 30 unknowns, since A1,A2,...A10 are unknown variables. Just because you appear not to care about the value of those parameters, they are still unknowns.
Justin Davis
Justin Davis 2017-3-10
ok, I appreciate the advice. I combined the 30 equations down to 10. So now I have 10 equations 10 unknowns. Using an fsolve I get the error "Too many output arguments"
John D'Errico
John D'Errico 2017-3-10
But I don't know what you did in calling fsolve. The error message just means you did not set up the call to fsolve properly. If you show what you did, we could help.
the cyclist
the cyclist 2017-3-10
In general, it is better to paste in actual code (or upload a *.m file), rather than an image, so that people can copy & paste the code into MATLAB.
Walter Roberson
Walter Roberson 2017-3-15
I would suggest vpasolve.
However I am not going to bother typing that all in by hand. I recommend posting as text rather than as image

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回答（1 个）

Brandon Eidson
Brandon Eidson 2017-3-15

0 个投票

Hey Justin, it looks like John has guided you to a good approach.  You should be able to use "fsolve" to calculate a solution.  You should refer to its documentation (linked to below) to determine how to best apply it to your situation.  
https://www.mathworks.com/help/optim/ug/fsolve.html#buta__s-3
The link specifically takes you to the section that describes the function outputs.  You should notice that you do not need all those output arguments.  Pick a single variable to store the "fsolve" function's output.  In your case, that single variable will store a vector.
You should also pay close attention to how to pass an equation to "fsolve".  Under the description of the "fsolve" function's inputs, you will see an example of how to create a function handle.

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