Indexing inside a function

2022 4 21
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The problem i am having is i want to use fminsearch for a fuction containing every value inside my two matrixes. As i am creating a saturation line for pressure. and want it to minimize the distance between my measured Temperatures and Pressures. Basicly reduce f1-f5 to one function that i can use a singe fminsearch on. Thanks in advance!
A = 10.493056201500981;
B = 1.663772278341260e+03;
x = [A,B];
Temperature = [101.5245 106.0325 107.8912 110.6541 114.8397];
Pressure = [106.0448 122.4084 132.3047 146.6630 172.5796];
f1 = @(x) sum(abs(Pressure(1)-(1/10000)*10^(x(1)-x(2)/(273+Temperature(1)))));
f2 = @(x) sum(abs(Pressure(2)-(1/10000)*10^(x(1)-x(2)/(273+Temperature(2)))));
f3 = @(x) sum(abs(Pressure(3)-(1/10000)*10^(x(1)-x(2)/(273+Temperature(3)))));
f4 = @(x) sum(abs(Pressure(4)-(1/10000)*10^(x(1)-x(2)/(273+Temperature(4)))));
f5 = @(x) sum(abs(Pressure(5)-(1/10000)*10^(x(1)-x(2)/(273+Temperature(5)))));
Optimalisering1 = fminsearch(f1,x);
Optimalisering2 = fminsearch(f2,x);
Optimalisering3 = fminsearch(f3,x);
Optimalisering4 = fminsearch(f4,x);
Optimalisering5 = fminsearch(f5,x);

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Matt J
Matt J 2022-4-21
编辑：Matt J 2022-4-21
Ran in:

1 个投票

Ran in:
This might be what you want,
A = 10.493056201500981;
B = 1.663772278341260e+03;
x0 = [A,B];
TemperatureKelvin = 273+[101.5245 106.0325 107.8912 110.6541 114.8397];
Pressure = [106.0448 122.4084 132.3047 146.6630 172.5796];
f= @(x) norm( Pressure-10.^( x(1)-4-x(2)./TemperatureKelvin ) ,1) ;
[Optimalisering,fopt] = fminsearch(f,x0)
Optimalisering = 1×2
1.0e+03 * 0.0126 2.4537
fopt = 4.3992

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