If statements comparing two character strings with multiple inputs

Question

Mikela Petersen 2021-2-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747317-if-statements-comparing-two-character-strings-with-multiple-inputs

评论： Mikela Petersen 2021-2-16

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

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per isakson 2021-2-16

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You overwrite the input arguments with the statements

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

Comment out these two statements.

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Answer 1

Fangjun Jiang 2021-2-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747317-if-statements-comparing-two-character-strings-with-multiple-inputs#answer_625157

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.