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copied!<p>SCATTER3 requires <code>x</code>, <code>y</code> and <code>z</code> and other grouping arguments to be equally-sized Nx1 vectors for a single series or NxM matrices for M series. </p> <p>You have full space 3D data. To make equally-sized coordinate vectors use <a href="http://www.mathworks.com/help/techdoc/ref/meshgrid.html" rel="noreferrer">MESHGRID</a> (or <a href="http://www.mathworks.com/help/techdoc/ref/ndgrid.html" rel="noreferrer">NDGRID</a>) function:</p> <pre><code>[X, Y, Z] = meshgrid(t, y, a); </code></pre> <p>Then you can use SCATTER3:</p> <pre><code>scatter3( X(:), Y(:), Z(:), [], S(:) ) </code></pre> <p>The problem is since it's full space data scatter3 will not be helpful specially if you have a lot of points. </p> <p>You can probably filter your S variable (something like <code>idx = S > 0</code>), then you can plot filtered data. </p> <p>If you really need to visualize all the data, look at <a href="http://www.mathworks.com/help/techdoc/visualize/f5-8666.html" rel="noreferrer">Volume visualization</a> in MATLAB documentation. I can recommend <a href="http://www.mathworks.com/help/techdoc/ref/slice.html" rel="noreferrer">SLICE</a> function, for example.</p> <p><strong>EDIT</strong></p> <p>Here is an example of full 3D space scatter plot for small vectors (<code>m</code>, <code>n</code>, <code>o</code> equal to 5) with <code>S = rand([m,n,o]); scatter3( X(:), Y(:), Z(:), [], S(:), 'filled' )</code></p> <p><img src="https://i.stack.imgur.com/gGb3q.png" alt="scatter example"></p> <p><strong>EDIT 2</strong></p> <p>From your comments to the other answer I found that you have 32x76050x4 matrix. You can actually plot 2D slice one at a time. you can do it in 2D with IMAGESC function, or in 3D with SLICE function.</p> <p>Try:</p> <pre><code>imagesc(S(:,:,k)) </code></pre> <p>where <code>k</code> is a number from 1 to 4 for the 3rd dimension.</p> <p>Or try </p> <pre><code>slice(S, [], [], 1:size(S,3)) shading flat </code></pre> <p><img src="https://i.stack.imgur.com/LzeAm.png" alt="slice example"></p>

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