MATLAB: How to compare string

if statementstring

i want to take input fuel=CH4 or CO or Co2, %its num + string input if fuel==CH4 % if fuel is CH4 i need to fix some value for variable %if fuel is Co or Co2 i need to fix some value can you please help me how to do it?

Best Answer

Try this:
fuel=input('select the gaseous component CH4,ethane,propane,butane,H2,CO,CO2,N2\n'); 
if prod(ismember(fuel,'CH4'))
    density=0.716; %kg/m^ 
    LCV=35.83; %MJ/m^3 
    cc=1; hh=4; oo=0; nn=0; 
    TMmass=cc+hh+oo+hh; 
    disp('total mass of CH4'); 
    disp(TMmass); 
end
if prod(ismember(fuel,'ethane'))
    density=1.342; %kg/m^3
    disp(density);
    LCV=63.76; %MJ/m^3
    disp(LCV);
    cc=2;
    disp(cc);
    hh=6;
    disp(hh);
    oo=0;
    disp(oo);
    nn=0;
    disp(nn);
    TMmass=cc+hh+oo+hh;
    disp('total mass of CH4');
    disp(TMmass);
end
Do not forget to enter your input in char form. Like
>>'CH4'
or
>>'ethane'
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