I am having trouble with the menu and switch case command because every time I try to get an answer for pressure, I get 5 answers in a matrix instead of one. Does anyone know what I am doing wrong?

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Yianni 2014-10-8

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评论： Yianni 2014-10-8

在 MATLAB Online 中打开

clear all, close all, nfig = 0;
choice = menu('Choose a gas.','Helium Gas','Hydrogen Gas','Oxygen Gas',...
    'Chlorine Gas','Carbon Dioxide Gas');
switch choice
    case 1
        a = 0.0341; b = 0.0237;
    case 2
        a = 0.244; b = 0.0266;
    case 3
        a = 1.36; b = 0.0318;
    case 4
        a = 6.49; b = 0.0562;
    case 5
        a = 3.59; b = 0.0427;
end
prompt = 'What is the temperature? (C) ';
T = input(prompt)+273;
prompt = 'What is the molar volume? (L/mol) ';
V = input(prompt);
Pressure = VDW(T,V);
prompt = Pressure;

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Sean de Wolski 2014-10-8

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It must be whatever VDW is doing because running everything up to there gives scalar values.

Put a breakpoint in VDW and see what it's doing!

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Sean de Wolski 2014-10-8

What's R?

Yianni 2014-10-8

R = 0.08206;

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