i can't run this program , the output is (Saturation: LinearInterval: [NaN NaN]), i don't know the meaning of the ouput

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mohamed
mohamed 2013-4-4
评论： mazen ali 2017-9-13
%water saturation calculation
Q=input('porosity of formation=');
Rw=input('water resistivity=');
Rt=input('true resistivity=');
x=input('type of formation=');
if x==sandformation
f=.62/Q^2.15;
elseif x==compactedformation
f=1/Q^2;
elseif x==chalkyformation
f=1/Q^2.2;
end
Ro=f*Rw;
s=sqrt(Ro/Rw);
sw=s*100;
disp(sw);

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2013-4-4
x=input('type of formation=','s');
switch x
case 'sandformation'
f=.62/Q^2.15;
case 'compactedformation'
f=1/Q^2;
otherwise % or case 'chalkyformation'
f=1/Q^2.2;
end

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