How to create a function that calculates and returns the volume and cross-sectional area of a cylinder based on the radius and height?

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Emre Tunc 2016-10-5

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评论： Emre Tunc 2016-10-5

Hello to matlabs user Please help me I am stuck on a problem :( Does anyone have code for a function that calculates and returns the volume and cross-sectional area of a cylinder based on the radius and height? I also need code for a function that radius and height can not be negative. Does anyone have this or have an idea how to do this? Thanks so much.

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Answer 1

Massimo Zanetti 2016-10-5

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Here it is

function A=sect_area_cylinder(R,H,alpha)
%Cylinder of radius R and height H,
%its base-circle center coincide with the point (0,0,0).
%The intersecting plane is supposed to rotate around the 
%line (x=0,y=H/2) with angle ALPHA (in degrees)
if (R<=0)||(H<=0)
    error('Input positive R,H');
end
if alpha==0
    %the cross-section is a circle
    A=R^2*pi;
elseif alpha==90
    %the cross section is a rectangle
    A=2*R*H;
elseif (0<alpha)&&(alpha<90)
    %the cross section is an ellipse
    %of short radius R and long radius R/cos(alpha)
    A=pi*R*R*cos(alpha*pi/180);
else
    disp('alpha in [0,90]');
end

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Massimo Zanetti 2016-10-5

Cross section is a circle only if alpha=0 (the intersecting plane is horizontal). Alpha is used for calculation on in the case it is greater than 0 and less than 90 because the radii of the ellipse depend on it.

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Emre Tunc 2016-10-5