Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Assuming a cylinder aligned with the <code>z</code>-axis, radii <code>R</code> linearly spaced along the unit height above the <code>XY</code>-plane (same assumptions as built-in <code>cylinder</code>):</p> <pre><code>function [x,y,z] = solidCylinder(varargin) %// Basic checks assert(nargin &gt;= 1, 'Not enough input arguments.'); assert(nargin &lt;= 3, 'Too many input arguments.'); assert(nargout &lt;= 3, 'Too many output arguments.'); %// Parse input N = 20; Ax = []; switch nargin case 1 %// R R = varargin{1}; case 2 %// Ax, R or R, N if ishandle(varargin{1}) Ax = varargin{1}; R = varargin{2}; else R = varargin{1}; N = varargin{2}; end case 3 %// Ax, R, N Ax = varargin{1}; R = varargin{2}; N = varargin{3}; end %// Check input arguments if ~isempty(Ax) assert(ishandle(Ax) &amp;&amp; strcmp(get(Ax, 'type'), 'axes'),... 'Argument ''Ax'' must be a valid axis handle.'); else Ax = gca; end assert(isnumeric(R) &amp;&amp; isvector(R) &amp;&amp; all(isfinite(R)) &amp;&amp; all(imag(R)==0) &amp;&amp; all(R&gt;0),... 'Argument ''R'' must be a vector containing finite, positive, real values.'); assert(isnumeric(N) &amp;&amp; isscalar(N) &amp;&amp; isfinite(N) &amp;&amp; imag(N)==0 &amp;&amp; N&gt;0 &amp;&amp; round(N)==N,... 'Argument ''N'' must be a finite, postive, real, scalar integer.'); %// Compute cylinder coords (mostly borrowed from builtin 'cylinder') theta = 2*pi*(0:N)/N; sintheta = sin(theta); sintheta(N+1) = 0; M = length(R); if M==1 R = [R;R]; M = 2; end x = R(:) * cos(theta); y = R(:) * sintheta; z = (0:M-1).'/(M-1) * ones(1,N+1); %' if nargout == 0 oldNextPlot = get(Ax, 'NextPlot'); set(Ax, 'NextPlot', 'add'); %// The side of the cylinder surf(x,y,z, 'parent',Ax); %// The bottom patch(x(1,:) , y(1,:) , z(1,:) , z(1,:) ); %// The top patch(x(end,:), y(end,:), z(end,:), z(end,:)); set(Ax, 'NextPlot', oldNextPlot); end end </code></pre> <p>To check whether points are inside a cylinder of height <code>L</code> (note: assuming a true 'cylinder' as created with <code>[R R]</code>, and NOT some compound object (cones with cylinders) as created by <code>[R1 R2 ... RN]</code> with at least two different values):</p> <pre><code>function p = pointInCylinder(x,y,z) %// These can also be passed by argument of course R = 10; L = 5; %// Basic checks assert(isequal(size(x),size(y),size(z)), ... 'Dimensions of the input arguments must be equal.'); %// Points inside the circular shell? Rs = sqrt(x.^2 + y.^2 + z.^2) &lt;= R; %// Points inside the top and bottom? Os = z&gt;=0 &amp; z&lt;=L; p = Rs &amp; Os; end </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POCylinder with filled top and bottom in matlab
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USRody Oldenhuis
    1. USRody Oldenhuis
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POCylinder with filled top and bottom in matlab
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload