Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You can adjust the transparency so lower values are more transparent. First, you need the handles to your slices:</p> <p><code>h = slice(X,Y,Z,V,sx,sy,sz);</code></p> <p><code>h</code> is not a single handle but a series of handles to the different slices. For any one handle you can change the transparency (or loop around for all n to change them all):</p> <p><code>set(h(n),'alphadata',get(h(n),'cdata'),'facealpha','flat')</code>;</p> <p><code>alphadata</code> is the data for transparency - by default this is "1" (opaque), so instead for each handle you can set it to the contents of <code>cdata</code>. <code>AlphaDataMapping</code> should already be set to <code>scaled</code> by default - so the values in <code>alphadata</code> are mapped to an alphamap, just as <code>cdata</code> values are mapped to your colormap (more on that later).</p> <p><code>facealpha</code> is a setting for how the alphadata is applied to the faces of an object - needs to be changed so that the values in alphadata are actually used.</p> <p>If you want to adjust how transparent values are or which are transparent, you can change the alphamap. The default map is just linear and can be seen by <code>plot(get(gcf,'Alphamap'))</code>, where is 0 = invisible and 1 = opaque. The length of the map can vary so you have a lot of freedom in adjusting it - for example you can completely zero out the lower part if you're not interested in those values:</p> <pre><code>a = alphamap('rampup',256); a(1:80)=0; alphamap(a); % only changes alphamap of current figure </code></pre> <p>Read more about transparency in Matlab <a href="http://www.mathworks.co.uk/help/matlab/visualize/making-objects-transparent.html" rel="nofollow">here</a>.</p>
    singulars
    1. This table or related slice is empty.
    1. PORemoving small values in slice
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USnkjt
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PORemoving small values in slice
      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
    1. COThis is a great answer thanks! I just have few questions: why would you loop around all n? Is it to define different transparencies for each slice? If I understand correctly, it is possible to make transparent some points by setting their alphamap to 0 (in your example, the 80 smallest values will be 0). So if I want to map that to my function V, I could define a threshold t for this function (discard the points for which V<t) by putting to 0 the points of the alphamap a that are such that: a<(t/256)?
      singulars
      1. PO
      1. USteaLeef
    2. COYes, each slice has its own handle - h(1)...h(n) where n is the number of slices, and each has to be set separately - so each point in the slice has a cdata value (sets color) and an alphadata value (sets transparency). And yes again on the thresholding - alternatively you could use `alim([amin amax])` which works pretty much like `clim` - so if you set `amin` to your threshold then all the values below that would be 0 (using the default alphamap) and all the values above `amax` would be set to 1. Editing the alphamap is more flexible, though.
      singulars
      1. PO
      1. USnkjt
    3. COI edited my code, but I think there is a problem with the colors?
      singulars
      1. PO
      1. USteaLeef
 

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