MATLAB: Multiple logical operators in if statement

if else iflogical operators

Hi, I have a quick question. Is it possible to write multiple logical conditions in if statement like this;

        if                  
                (s < (3 * a + b) * 0.25) || (s > b)         ||... 
                 (mflag)  && (abs(s-b) >=  (abs(b-c) * 0.5)) ||...
    (~mflag) && (abs(s-b) >= (c-d) * 0.5)       ||...
    (mflag)  && (abs(b-c) < tol)                ||...
    (~mflag) && (abs(c-d) < tol)
    
      % bisection method
      s = (a+b)*0.5; 
      mflag = true;    
    else
    
      mflag = false;
        end

Best Answer

Itâ€™s definitely possible to write it because you just demonstrated that by writing it.

You have a series of logical tests that appear to be constructed correctly, providing that all the arguments are scalars.

The question is if it makes sense logically and does what you want it to do. Only you can determine that.

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MATLAB: How to plot this function using Brent’s method

f=@(u) u*(1+0.7166/cos(25*sqrt(u)))-1.6901e-2; %Equation 
a=-10;
b=+10;
err=0.001;
%Testing root is bracketed between [a b]
if f(a)*f(b) >=0
    opts=struct('WindowsStyle','model','Interpreter','tex');
    F=errordlg('The Root is out of the Brackets,increase a and b values'....
        ,'Roots Are Not Bracketed',opts); %Message Box
end
%Swapping a and b Contents
if abs(f(a)) < abs(f(b))
    L=a; a=b; b=L;
end
c=a;
MFlag=1;
%Main Loop
delta =err; i=0;
while abs(b-a) >=err
    i=i+1;
    if f(a) ~=f(c)&&f(b) ~=f(c)
        s=a*f(b)*f(c)/(f(a)-f(b))*(f(a)-f(c))+....
            b*f(a)*f(c)/((f(b)*f(a))*(f(b)-f(c)))+...
            c*f(a)*f(b)/((f(c)-f(a))*(f(c)-f(b))); %Inverse Quadratic Interpolation
    else
        s=b-f(b)*(b-a)/(f(b)-f(a));  %Secant method
    end
    if s<=(3*a+b)/4 || s>=b ||....
            (MFlag==1 && abs(s-b) >= abs(b-c)/2) ||....
            (MFlag==0 && abs(s-b) >= abs(c-d)/2) ||....
            (MFlag==1 && abs(b-c) < abs(delta)) ||....
            (MFlag==0 && abs(c-d) >= abs(delta))
        s=(a+b)/2;  %Bisection Method
        MFlag=1;
    else
        MFlag=0;
    end
    %Calculate f(s)
    d=c; c=b;
    if f(a)*f(s) <0
        b=s;
    else
        a=s;
    end
    %Swapping a and b contents
    if abs(f(a)) < abs(f(b))
        if abs(f(a)) < abs(f(b))
        L=a; a=b; b=L;
        end
    end
    ss(i,1)=s;
    dd(i,1)=d;
    ii(i,1)=i;
end
plot(1:i,ss,'Linewidth',2);
grid on
title('Brent Method')
xlabel('Number of Itterations')
ylabel('Root Contents')

Best Answer

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MATLAB: Is there a logical NAND operation in MATLAB like the logical AND operation ‘&’

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