MATLAB: What can I use as a Plus or Minus sign

opperations

In this equation I can't figure out how to make the + into a plus or minus sign to get both answers other than doing it twice with s1 and s2 instead of s.

s=(-800/(2*.1))+(sqrt(((800/(.1*2))^2)-(1/(.1*.000001))));

Best Answer

s=(-800/(2*.1))+[1 -1]*(sqrt(((800/(.1*2))^2)-(1/(.1*.000001))))

Related Solutions

MATLAB: Diagonal matrices with spdiags

s=0.12;
N_r=30;
r=linspace(0,1,N_r)';
dr=r(2);
r_plus=r+0.5*dr;
r_minus=r-0.5*dr;
a_plus=s*r_plus(1:end-1).^2;
a_minus=s*r_minus(1:end-1).^2;
a=-(r.^2+s*(r_plus.^2+r_minus.^2));
D=[[a_minus(:);0],   a(:), [0;a_plus(:)]]; %<---changed
    
B=spdiags(D,-1:1,N_r,N_r);  %<--changed
B(1,1)=-1;B(1,2)=1;
B(N_r,N_r-1)=s*(r_plus(N_r)^2+r_minus(N_r)^2);

MATLAB: “plus/minus” sign operator

It depends what you want to do with it.

M = [1 1 1; 1 1 -1; 1 -1 1; 1 -1 -1; -1 1 1; -1 1 -1; -1 -1 1; -1 -1 -1];

Out = (M * Row')' ;

Each row of Out is what you want.

You might want to programatically generate M if you have more columns on your row.

Best Answer

Related Solutions

MATLAB: Diagonal matrices with spdiags

MATLAB: “plus/minus” sign operator

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