How to do input correctly

clc;
clear;
Metal=input('Choose a metal material:');
if Metal==AISI1020
else S_y=427; G=80,000; v=0.29; E=207,000
    if Metal==Alloy6061-T6
    else S_y=276; G=26,000; v=0.33; E=69,000
        if Metal==SAE4340
        else S_y=910; G=83,000; v=0.29; E=214,000
        end
    end
end

Hello,

I want to choose material that input, but have there is an error problem.

Thanks for helping :)

Answer 1

[Stephen23]

Metal = input('Choose a metal material:','s');
switch Metal
    case 'AISI1020'
        S_y = 427;
        G = 80.000; % decimal comma changed to decimal point
        v = 0.29;
        E = 207.000; % decimal comma changed to decimal point
    case 'Alloy6061-T6'
        S_y = 276;
        G = 26.000; % decimal comma changed to decimal point
        v = 0.33;
        E = 69.000; % decimal comma changed to decimal point
    case 'SAE4340'
        S_y = 910;
        G = 83.000; % decimal comma changed to decimal point
        v = 0.29;
        E = 214.000; % decimal comma changed to decimal point
    otherwise
        error('unknown input')
end

[the cyclist]

@Emilia, you might also want to consider using a different input function, such as listdlg, to save your user the error-prone task of typing out the full name. You can present them with a pre-defined list instead.

[Emilia]

Ok I will try this method too. Thanks to @Stephen Cobeldick and @the cyclist :)