Create a Matlab program to calculate the stoichiometric AFR for the following hydrocarbons: • Methane • Ethane • Propane • Butane • Pentane • Hexane • Octane • Decane and • Dodecane ....Plot their variation with carbon to hydrogen ratio.

I have made a basic matlab programme for this code to run but plot is not generating.How should I approach for its plot generation?

%Stoichiometric air fuel ratio(AFR) by moles(a) and by mass(b)
r=[];
c= menu('Enter Carbon atoms= ',1,2,3,4,5,6,8,10,12);
h=(2*c)+2;
disp(['for ',num2str(c),' carbon atom,Hydrogen atoms=  ',num2str(h)])
x=c;
y=h/2;
a=x+(y/4);
b=(a*4.76*29)/((12*c)+(h*1));
r=c/h;
disp(['Stoichiometric AFR by moles=', num2str(a)])
disp(['Stoichiometric AFR by mass=',num2str(b)])
plot(a,r)

[Rik]

What do you want your plot to show? You are currently only plotting a single point, but by default plot doesn't have a point marker. Read the documentation for plot to see all available options.

[Parag Bendre]

I want to plot AFR by moles vs r(ratio). how can I plot the graph instead of point.

[Steven Lord]

Your c variable is a scalar (a 1-by-1 array.) Because h is created from c by multiplying by a scalar and adding a scalar, h is also a scalar. The way they're defined x, y, a, b, and r are all scalars as well.

So let's say that I clicked the 6 button in the menu. Describe exactly what you want to plot. Be detailed; give the coordinates of the points you want to plot and how you chose those points to be plotted. That information may help us suggest how to generate those points in code.

[Muhammad Anas khan]

sir plz help i want the stoichiometry of C02+4H2-----------> CH4+2H2O

[Rik]

@Muhammad Anas khan You forgot to ask a question. As far as your comment is a question it is not about Matlab yet.

Have a read here and here. It will greatly improve your chances of getting an answer.