MATLAB: How to plot a graph(r,eta), if in equation have different known constants value

please tell me how i can plot r vs eta ?

function 
[ r ] = viscous(G,A,X1,X2,eta1,eta2,dash1,dash2)
r=(G/A)*(x1*log((eta-eta1)/(dash1-eta1))+x2*log((eta-eta2)/(dash1-eta2)))
end
If i have, G=[2.4,0.1,3],A=[2,1,8],X1=[4,1,10],X2=[5,0.5,8],dash1=[1,5,30], eta1=[10,1,16],eta2=[4,1,10];

Best Answer

G=[2.4,0.1,3] ;
A=[2,1,8];
x1=[4,1,10] ;
x2=[5,0.5,8] ;
dash1=[1,5,30] ;
eta1=[10,1,16];
eta2=[4,1,10];
eta = 1:1:3 ;
r=(G./A).*(x1.*log((eta-eta1)./(dash1-eta1))+x2.*log((eta-eta2)./(dash1-eta2)))
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