invalid use of operator
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>>shitathatsia = @(x) 2.7*cos(25*x^2+8*x)-10*x*sin(6*x)
starrt=-1
ennd=1
pitaron= (starrt+ennd)/2
while sqrt((shitathatsia(pitaron))^2)> 0.001
if(shitathatsia(pitaron)) * shitathatsia(start) <0
starrt = pitaron
if shitathatsia(pitaron)) * shitathatsia(start) >0
ennd=pitaron
end
pitaron=(starrt+ennd)/2
end
fprintf(pitaron)
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Réponses (2)
James Tursa
le 3 Mai 2021
You are missing a ( after the second "if", and you are missing an "end" statement. That being said, my suggestion would be to use an "else" instead as that appears to be your intent. E.g.,
if ( condition )
starrt = pitaron;
else
ennd = pitaron;
end
8 commentaires
Abdul-Hamid Mohammed
le 27 Mar 2022
for i=1:length(t)-1
x(i+1)=x(i)+(a*(x^2)(i)*(1+B(x^2)(i)-q*x(i)*E(i)))*Dt;
E(i+1)=E(i)+(z*(p*q*x(i)*E(i)-c*E(i)))*Dt;
end;
I am getting invalid use of operator with the above syntex, pls how do i resolve it. thank you.
4 commentaires
Abdul-Hamid Mohammed
le 27 Mar 2022
% Euler's Method
% Initial conditions and setup
% x(t+1)=x(t)+(a*(x(t)^2)*(1+B(x(t)^2)-q*x(t)*E(t)))*Dt
% E(t+1)=E(t)+(z*(p*q*x(t)*E(t)-c*E(t)))*Dt
%
%=======================================================================
a=1; alpha value
B=25; beta value
q=0.1; %catchability
z=0.1; %effort
p=100; %price
c=4; %cost
Dt=0.01; %delta t
timesteps=50;
t=0.1:Dt:timesteps; %array with time
for i=1:length(t)-1
x(i+1)=x(i)+(a*(x(i)^2)*(1+B(x(i)^2)-q*x(i)*E(i)))*Dt;
E(i+1)=E(i)+(z*(p*q*x(i)*E(i)-c*E(i)))*Dt;
end;
Walter Roberson
le 27 Mar 2022
B(x(i)^2) is a request to index your scalar value B at the location determined by the calculation. Perhaps you forgot a multiplication.
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