getting an equation from multiple variables

2021 2 2
1 个回答
更新时间：2021 2 3
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I need to get the equation of a multiple variables. I have the data a matrix of 5 coulomns; one coloumn for the output and the others for the variables.
Did anyone use a function to get the equation parameters?

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Bob Thompson
Bob Thompson 2021-2-2
I don't understand what you're asking for. Are you wanting to try and figure out the function based on the inputs and output? Or are you wanting to generate the output for a known equation using the four inputs?
Essam Ali
Essam Ali 2021-2-2
I want to get the equation as y=5x+3y+z-3W something like that.
James Tursa
James Tursa 2021-2-2
Are you trying to fit a curve to some data? E.g., linear regression?
Essam Ali
Essam Ali 2021-2-3
not curve but an output of experimental results from variables.
Bob Thompson
Bob Thompson 2021-2-3
Something like:
out = 5*(variables(:,1))+3*(variables(:,2))+variables(:,3)-3*(variables(:,4));
Essam Ali
Essam Ali 2021-2-3
No. IF I have two variables affecting third one. as example power=Voltage*current.If I have a matrix of Third coloumns for different readings of power, voltage and current but I don't know the equation(power=Voltage*current), how can I get the unknown equation?
James Tursa
James Tursa 2021-2-3
There is no magic method for determining a formula from arbitrary data. Typically you would have some idea about what the data represents and get a formula from that. Then plotting and trying various fits to see how well it matches expectations for residuals, etc.
Essam Ali
Essam Ali 2021-2-3
Polyfit function does this but in one variable

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回答（1 个）

madhan ravi
madhan ravi 2021-2-2
编辑：madhan ravi 2021-2-2
Ran in:

0 个投票

Ran in:
MAtrix = [3, 6, 1, 3, 8; 3, 6, 1, 3, 9];
syms x y z w Out
Out * MAtrix(:, 1) == (MAtrix(:, 2 : end) * [x, y, z, w].') % something like this?
ans = 

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