How do I fix negative values in a function to zero ?

Question

KIPROTICH KOSGEY 2023-7-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1993678-how-do-i-fix-negative-values-in-a-function-to-zero

评论： Steven Lord 2023-9-1

I have the following script and function with a code to fix the negative values to zero but it is failing for some reason. What could be the issue?

%Script:

%initial conditions

y0=[18.16;0.52;25.64;172.6;179.48;0.0005;2;0.0005;55;50;0.5];

tSpan=[0 535];

M1=eye(11);

options = odeset('RelTol',1e-20,'AbsTol',1e-10,'Mass',M1,'MassSingular', 'maybe','MStateDependence','strong','InitialStep',1e-10, 'MStateDependence','strong');

[tSol, ySol]=ode15s(@(t,y) MBBR12(t,y), tSpan, y0, options);

%Funtion as follows:

function fval=MBBR12(t,y)

%Define the three variables

Xaob=y(1);

Xnb=y(2);

Xnsp=y(3);

Xamx=y(4);

Xhan=y(5);

Xs=y(6);

Sse=y(7);

Sno3=y(8);

Sno2=y(9);

Snh4=y(10);

So2=y(11);

T=303;

%aob

O1=68/(0.00831*293*(273+T)); u1=0.054*exp(O1*(T+293)); Ko2aob=0.6; Knh4aob=2.4; Yaob=0.15; Kno3aob=0.5;

%nb

O2=44/(0.00831*293*(273+T)); u2=0.047*exp(O2*(T+293)); Ko2nb=2.2; Kno2nb=0.5*1.375; Ynb=0.041;Kno3nb=0.5;

%nsp

O3=44/(0.00831*293*(273+T)); u3=0.047*exp(O3*(T+293)); Ko2nsp=2.2; Kno2nsp=5.5; Ynsp=0.041;Kno3nsp=0.5;

%amx

O5=71/(0.00831*293*(273+T)); u5=0.0022*exp(O5*(T+293)); Kno2amx=0.05; Knh4amx=0.07; Yamx=0.159; Ko2amx=0.01; Kno3amx=0.5;

%han

O6=0.069;u6=7.2*exp((T+293)*0.069); KSsehan=2; Kno2han=0.5;Kno3han=0.5; YNo2han=0.3; Ko2han=0.2;

YNo3han=0.43; Yhaer=0.54;

%other constants

baob=0.0054*exp(O6*(T+293)); bnb=0.0025*exp(O6*(T+293));bnsp=bnb; bamx=0.00013*exp(O6*(T+293)); bhan=0.008*exp(O6*(T+293));

INBM=0.07; fI=0.1; namx=0.5; nhan=0.6;naob=0.5; nnb=0.5; nnsp=0.5;

KX=1; KH=0.125*exp(0.069*(T+293)); INXI=0.02;

% input parameters

Sseo=300; Sno3o=0.2; Qo=75; Xso=250;

Snh4o=650; Sno2o=0.2; So2o=0;

%oxygen transfer parameters

KaL=80;

V=1400; SRT=40;

%fix output values to zero

Sno3(Sno3<0)=0;Xaob(Xaob<0)=0;Xnb(Xnb<0)=0;Xnsp(Xnsp<0)=0;Xamx(Xamx<0)=0;Xhan(Xhan<0)=0;Xs(Xs<0)=0;

Sse(Sse<0)=0;Sno2(Sno2<0)=0;Snh4(Snh4<0)=0;So2(So2<0)=0;

% main functions CSTR 1

fval=[((0-V*Xaob/SRT)/V + u1*(So2/(Ko2aob+So2))*(Snh4/(Knh4aob+Snh4))*Xaob - baob*(So2/(Ko2aob+So2))*Xaob - baob*naob*((Ko2aob/(Ko2aob+So2))*(Sno2+Sno3)/(Kno3aob+Sno2+Sno3))*Xaob)

((0-V*Xnb/SRT)/V + u2*(Sno2/(Kno2nb+Sno2))*(So2/(Ko2nb+So2))*Xnb - bnb*(So2/(Ko2nb+So2))*Xnb - bnb*nnb*((Ko2nb/(Ko2nb+So2))*(Sno2+Sno3)/(Kno3nb+Sno2+Sno3))*Xnb)

((0-V*Xnsp/SRT)/V + u3*(Sno2/(Kno2nsp+Sno2))*(So2/(Ko2nsp+So2))*Xnsp - bnsp*(So2/(Ko2nsp+So2))*Xnsp - bnsp*nnsp*((Ko2nsp/(Ko2nsp+So2))*(Sno2+Sno3)/(Kno3nsp+Sno2+Sno3))*Xnsp)

((0-V*Xamx/SRT)/V + u5*((Snh4/(Knh4amx+Snh4))*(Sno2/(Kno2amx+Sno2))*(Ko2amx/(Ko2amx+So2)))*Xamx-bamx*(So2/(Ko2amx+So2))*Xamx - bamx*namx*((Ko2amx/(Ko2amx+So2))*(Sno2+Sno3)/(Kno3amx+Sno2+Sno3))*Xamx)

((0-V*Xhan/SRT)/V + (u6*(Sse/(KSsehan+Sse))*(Sno2/(Kno2han+Sno2))*(Ko2han/(Ko2han+So2)) + u6*(Sse/(KSsehan+Sse))*(Sno3/(Kno3han+Sno3))*(Ko2han/(Ko2han+So2))+u6*((Sse/(KSsehan+Sse))*(So2/(Ko2han+So2)))*Xhan)- bhan*(So2/(Ko2han+So2))*Xhan - bhan*nhan*((Ko2han/(Ko2han+So2))*(Sno2+Sno3)/(Kno3han+Sno2+Sno3))*Xhan)

((Qo*Xso-Qo*Xs)/V - KH*((Xs/Xhan)/(KX+(Xs/Xhan)))*Xhan)

((Qo*Sseo-Qo*Sse)/V - (u6*nhan*(1/YNo2han)*(Sse/(KSsehan+Sse))*(Sno2/(Kno2han+Sno2))*(Ko2han/(Ko2han+So2)))*Xhan -(u6*nhan*(1/YNo3han)*(Sse/(KSsehan+Sse))*(Sno3/(Kno3han+Sno3))*(Ko2han/(Ko2han+So2)))*Xhan - ((u6/Yhaer)*(Sse/(KSsehan+Sse))*(So2/(Ko2han+So2))*Xhan) + KH*((Xs/Xhan)/(KX+(Xs/Xhan)))*Xhan)

((Qo*Sno3o-Qo*Sno3)/V - (u6*nhan*((1-YNo3han)/(2.86*YNo3han))*(Sse/(KSsehan+Sse))*(Sno3/(Kno3han+Sno3))*(Ko2han/(Ko2han+So2)))*Xhan + (u5/1.14)*(Snh4/(Knh4amx+Snh4))*(Sno2/(Kno2amx+Sno2))*(Ko2amx/(Ko2amx+So2))*Xamx + (u2/Ynb*(Sno2/(Kno2nb+Sno2))*(So2/(Ko2nb+So2))*Xnb) + ((u3/Ynsp)*(Sno2/(Kno2nsp+Sno2))*(So2/(Ko2nsp+So2))*Xnsp) - ((1-fI)/2.86)*baob*naob*(Ko2aob/(Ko2aob+So2))*(Sno2+Sno3)/(Kno3aob+Sno2+Sno3)*Xaob - ((1-fI)/2.86)*bnb*nnb*(Ko2nb/(Ko2nb+So2))*(Sno2+Sno3)/(Kno3nb+Sno2+Sno3)*Xnb - ((1-fI)/2.86)*bnsp*nnsp*(Ko2nsp/(Ko2nsp+So2))*(Sno2+Sno3)/(Kno3nsp+Sno2+Sno3)*Xnsp - ((1-fI)/2.86)*bamx*namx*(Ko2amx/(Ko2amx+So2))*(Sno2+Sno3)/(Kno3amx+Sno2+Sno3)*Xamx-((1-fI)/2.86)*bhan*nhan*(Ko2han/(Ko2han+So2))*(Sno2+Sno3)/(Kno3han+Sno2+Sno3)*Xhan)

((Qo*Sno2o-Qo*Sno2)/V - (((1-YNo2han)/(1.71*YNo2han))*u6*nhan*(Sse/(KSsehan+Sse))*(Sno2/(Kno2han+Sno2))*(Ko2han/(Ko2han+So2))*Xhan) - (((u5/Yamx)+(u5/1.14))*(Snh4/(Knh4amx+Snh4))*(Sno2/(Kno2amx+Sno2))*(Ko2amx/(Ko2amx+So2)))*Xamx + ((u1/Yaob)*(So2/(Ko2aob+So2))*(Snh4/(Knh4aob+Snh4)))*Xaob - ((u2/Ynb)*(Sno2/(Kno2nb+Sno2))*(So2/(Ko2nb+So2))*Xnb) - ((u3/Ynsp)*(Sno2/(Kno2nsp+Sno2))*(So2/(Ko2nsp+So2)))*Xnsp)

((Qo*Snh4o-Qo*Snh4)/V - (u1*(INBM+1/Yaob)*(So2/(Ko2aob+So2))*(Snh4/(Knh4aob+Snh4)))*Xaob -(u5*(INBM+1/Yamx)*(Snh4/(Knh4amx+Snh4))*(Sno2/(Kno2amx+Sno2))*(Ko2amx/(Ko2amx+So2)))*Xamx - (u2*INBM*(Sno2/(Kno2nb+Sno2))*(So2/(Ko2nb+So2)))*Xnb -(u3*INBM*(Sno2/(Kno2nsp+Sno2))*(So2/(Ko2nsp+So2)))*Xnsp - INBM*u6*nhan*((Sse/(KSsehan+Sse))*(Sno2/(Kno2han+Sno2))*(Ko2han/(Ko2han+So2)))*Xhan - u6*INBM*nhan*((Sse/(KSsehan+Sse))*(Sno3/(Kno3han+Sno3))*(Ko2han/(Ko2han+So2)))*Xhan - u6*INBM*((Sse/(KSsehan+Sse))*(So2/(Ko2han+So2)))*Xhan + (INBM-(fI*INXI))*baob*naob*((Ko2aob/(Ko2aob+So2))*(Sno2+Sno3)/(Kno3aob+Sno2+Sno3))*Xaob + (INBM-(fI*INXI))*bnb*nnb*((Ko2nb/(Ko2nb+So2))*(Sno2+Sno3)/(Kno3nsp+Sno2+Sno3))*Xnb +(INBM-(fI*INXI))*bnsp*nnsp*((Ko2nsp/(Ko2nsp+So2))*(Sno2+Sno3)/(Kno3nsp+Sno2+Sno3))*Xnsp + (INBM-(fI*INXI))*bamx*namx*((Ko2amx/(Ko2amx+So2))*(Sno2+Sno3)/(Kno3amx+Sno2+Sno3))*Xamx + (INBM-(fI*INXI))*bhan*nhan*((Ko2han/(Ko2han+So2))*(Sno2+Sno3)/(Kno3han+Sno2+Sno3))*Xhan +(INBM-(fI*INXI))*baob*(So2/(Ko2aob+So2))*Xaob + (INBM-(fI*INXI))*bnb*(So2/(Ko2nb+So2))*Xnb +(INBM-(fI*INXI))*bnsp*(So2/(Ko2nsp+So2))*Xnsp + (INBM-(fI*INXI))*bamx*(So2/(Ko2amx+So2))*Xamx + (INBM-(fI*INXI))*bhan*(So2/(Ko2han+So2))*Xhan)

((Qo*So2o-Qo*So2)/V +KaL*(8-So2)-(((1-Yhaer)/Yhaer)*u6*(Sse/(KSsehan+Sse))*(So2/(Ko2han+So2)))*Xhan -(((3.43-Yaob)/Yaob)*u1*(So2/(Ko2aob+So2))*(Snh4/(Knh4aob+Snh4)))*Xaob - (((1.14-Ynb)/Ynb)*u2*(Sno2/(Kno2nb+Sno2))*(So2/(Ko2nb+So2)))*Xnb - (((1.14-Ynsp)/Ynsp)*u3*(Sno2/(Kno2nsp+Sno2))*(So2/(Ko2nsp+So2)))*Xnsp - (1-fI)*baob*(So2/(Ko2aob+So2))*Xaob - (1-fI)*bnb*(So2/(Ko2nb+So2))*Xnb -(1-fI)*bnsp*(So2/(Ko2nsp+So2))*Xnsp - (1-fI)*bamx*(So2/(Ko2amx+So2))*Xamx - (1-fI)*bhan*(So2/(Ko2han+So2))*Xhan)];

end

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Answer 1

John D'Errico 2023-7-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1993678-how-do-i-fix-negative-values-in-a-function-to-zero#answer_1269938

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Have something like this be the last thing you do in the function.

x = max(x,0);

Or,

x(x<0) = 0;

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fahad isah adam 2023-9-1

移动：Bruno Luong 2023-9-1

Thank You.

Steven Lord 2023-9-1

For this particular scenario, where you're trying to constrain the solution to a system of ODEs to be non-negative, rather than calling max at the end of the ODE function I'd use the NonNegative option for ODEs if it's supported for the ODE solver you're using. See this example in the documentation.

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