Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Ok, I was going to say that this could easily be done using <code>TriScatteredInterp()</code> on <code>PointsH</code>. I realised that it was not that simple to get it to produce what I wanted. I resorted to adding extra points and moving them around to create the right interpolation triangles.</p> <p>I finally got something that can produce the z-value corresponding to the point (a,b).</p> <p>Here is what I ended up doing...</p> <pre><code>epsilon = 1e-8; PointsL_diff = epsilon*[ [ -1 0 0] % P1 [ 0 -1 0] [ 0 -1 0] [ 1 0 0] [ 0 -1 0] % added [ 1 -1 0] [ 1 0 0] % P5 [ 0 -1 0] [ 1 1 0] [ 1 1 0] [ 0 1 0] [ 1 0 0] % added [ 0 1 0] [ -1 0 0] % P10 [ 0 1 0] % added [ -1 1 0] [ -1 1 0] [ -1 0 0] [ 0 -1 0] % added [ -1 -1 0] [ -1 1 0] % P15 [ -1 0 0] [ 0 1 0] % added [ -1 -1 0] [ -1 -1 0] % P18 ]; PointsL = [ [ 32 0 0] % P1 [ 32 0 0] % added [387 0 0] [475 0 0] [475 0 0] % added [475 30 0] [602 30 0] % P5 [602 30 0] % added [602 220 0] [475 220 0] [475 737 0] [475 737 0] % added [387 737 0] [ 32 737 0] % P10 [ 32 737 0] % added [ 32 555 0] [ 0 555 0] [ 0 277 0] [ 0 277 0] % added [ 27 277 0] [ 27 250 0] % P15 [ 0 250 0] [ 0 250 0] % added [ 0 57 0] [ 32 57 0] % P18 ]; PointsH = [ [ 32 0 270] % P1 [387 0 270] [475 0 183] [475 30 183] [602 30 183] % P5 [602 220 183] [475 220 183] [475+epsilon 220 183] % added [475 220+epsilon 183] % added [475 737 183] [387 737 270] [387 220 270] % added [ 32 737 270] % P10 [ 32 555 270] [ 0 555 270] [ 0 277 270] [ 27 277 270] [ 27 250 270] % P15 [ 0 250 270] [ 0 57 270] [ 32 57 270] % P18 ]; % plot bounds x_min = -200; x_max = 800; y_min = -200; y_max = 800; newPointsL = PointsL + PointsL_diff; x = [PointsH(:,1); newPointsL(:,1); x_min; x_max; x_min; x_max]; y = [PointsH(:,2); newPointsL(:,2); y_min; y_min; y_max; y_max]; z = [PointsH(:,3); newPointsL(:,3); 0; 0; 0; 0]; F = TriScatteredInterp(x,y,z); % default is linear interpolation % find z-value for point (a,b) a = 100; b = 200; z_value = F(a,b) % generate mesh and plot surface ti_x = x_min:10:x_max; ti_y = y_min:10:y_max; [qx,qy] = meshgrid(ti_x,ti_y); qz = F(qx,qy); mesh(qx,qy,qz); hold on; plot3(x,y,z,'o'); </code></pre> <p>... and here is the figure the code produces:</p> <p><img src="https://i.stack.imgur.com/mSB9F.jpg" alt="Mesh of simple building."></p>
    singulars
    1. This table or related slice is empty.
    1. POMeasure height of 3d block for [x y] point
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USuser1884905
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POMeasure height of 3d block for [x y] point
      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. COThat's what I need. Thank you very much !
      singulars
      1. PO
      1. UShsz
    2. CO@hsz Glad I could help - even if it wasn't the most beautiful solution...
      singulars
      1. PO
      1. USuser1884905
 

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