How can I solve This Equation?

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mirko d'antoni
mirko d'antoni 2016-4-18
评论： Walter Roberson 2016-4-18
I all, I have to solve thise equation VFA=408.5 +25.4 pH + 33.9 COD/N -1.8 pH x COD/N +1.8 pH2 -0.3 COD/N2
where pH is a column vector and COD/N is a row vector (10000 numbers).
the result should be a matrix...
Thanks for the help!!

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Walter Roberson
Walter Roberson 2016-4-18
Use ndgrid() or meshgrid() and vectorize your expressions. You will need to figure out what pH2 and N2 are, though.
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mirko d'antoni
mirko d'antoni 2016-4-18
Yessss thanks for the huge help!!!
Walter Roberson
Walter Roberson 2016-4-18
[gpH, gCODN] = ndgrid(pH, COD/n);
VFA = 408.5 + 25.4 * gpH + 33.9 * gCODN - 1.8 * gpH .* gCODN + 1.8 * gpH.^2 - 0.3 * gCODN.^2;
Note: I have interpreted COD/N2 here as (COD/N)^2 . If it was intended to be COD/(N^2) then the above code is not correct.

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