If statements comparing two character strings with multiple inputs

I have to use two strings that include different characters such as str1= ["rho" , "mu" , "nu"] and str2= ["SI", "BG"] and go from there. I need to use IF statements to get the correct values if i called the function from the command line: h20_props(50,"nu","SI) but when I do this, nothing happens. I don't even get an error. it's just nothing. Here's what I have:

function h20_props(T, str1, str2)

str1 = ["rho","mu","nu","pv"];
str2 = ["SI", "BG"];

if strcmpi(str1,"mu")
    if strcmpi(str2, "SI")
        dv = h20_mu_SI(T);
        fprintf('dv_si = %g\n',dv);
    else
        dv = h20_mu_BG(T);
        fprintf('dv_bg = %g\n',dv);
    end
elseif strcmpi(str1,"nu")
        if strcmpi(str2,"SI")
            kv = h20_nu_SI(T);
            fprintf('kv_si=%g\n',kv);
        else
            kv = h20_nu_BG(T);
            fprintf('kv_bg=%g\n',kv);
        end
elseif strcmpi(str1, "pv")
        if strcmpi(str2, "SI")
            vp = h20_pv_SI(T);
            fprintf('vp_si=%g\n',vp);
        else
            vp = h20_pv_BG(T);
            fprintf('vp_bg=%g\n',pv);
        end
    end
end

[per isakson]

You overwrite the input arguments with the statements

str1 = ["rho","mu","nu","pv"];
str2 = ["SI", "BG"];

Comment out these two statements.

Answer 1

[Fangjun Jiang]

variable 'str1' and 'str2' are supposed to take values from function input arguments when you call h20_props(50,"nu","SI"). But inside your fuction, the values were over-written in the first two lines of code. What are you trying to do?

I believe it should work if you comment out those two lines.

[Mikela Petersen]

this was exactly what i was doing wrong. I commented the two string lines out and now everything works! Thank you!