Improve documentation & fall-back options

ComputeMostHexagonalSampling.m

@@ -12,11 +12,13 @@ function [packingDensity, L_optimum, isDegenerate, L_CAIPI_A, packingDensityCAIP
 %                           [same unit as sliceSpacing, sliceThickness & sliceGap]
 %
 %   sliceSpacing            distance between simultaneously excited slices
-%                           (only used if all input arguments available)
+%                           (only used if either of the other input arguments
+%                           {nSlicesSimultaneously, nSlicesTotal, sliceThickness, sliceGap}
+%                           unavailable)
 %                           [same unit as FOV_inplane, sliceThickness & sliceGap]
 %
 %   nSlicesSimultaneously   number of simultaneously excited slices
-%                           (only needed if sliceSpacing empty)
+%                           (only needed if sliceSpacing empty or blipped-CAIPIRINHA options are required)
 %
 %   nSlicesTotal            total number of slices
 %                           (only needed if sliceSpacing empty)
@@ -67,8 +69,15 @@ function [packingDensity, L_optimum, isDegenerate, L_CAIPI_A, packingDensityCAIP
 % Author: Maria Engel
 % (c) Cardiff University Brain Research Imaging Centre (CUBRIC), Cardiff University, United Kingdom
 
-if nargin == 7
-    sliceSpacing = nSlicesTotal*(sliceThickness+sliceGap)/nSlicesSimultaneously;
+if nargin > 6
+    if ~isempty(nSlicesTotal+sliceThickness+sliceGap+nSlicesSimultaneously)
+        sliceSpacing = nSlicesTotal*(sliceThickness+sliceGap)/nSlicesSimultaneously;
+    end
+end
+
+if nargin < 3 || isempty(sliceSpacing)
+    error(['Please provide either sliceSpacing or nSlicesSimultaneously, nSlicesTotal, ' ...
+        'sliceThickness and sliceGap as input arguments.']);
 end
 
 if nargin < 8 || isempty(doPlot)
@@ -83,10 +92,22 @@ if nargin < 10
     gifName = [];
 end
 
+if nargout>7
+    doPlot = true;
+end
+
 % in-plane spacing of lines in k-space
 deltak_inplane = 2*pi*R_inplane/FOV_inplane;
 kzSlabThickness = 2*pi/sliceSpacing;
 
+if nargin < 4
+    nSlicesSimultaneously = ceil(kzSlabThickness*R_inplane/deltak_inplane);
+    if nargout > 3
+        warning(['Please provide nSlicesSimultaneously to retrieve correct blipped-CAIPIRINHA '...
+            'options, assuming %i simultaneously excited slices.'],nSlicesSimultaneously);
+    end
+end
+
 % As soon as L is so large that the distance to the chronologically next point is smaller than to
 % the next point after a down-blip, the grids are going to get only worse = less homogeneous, i.e.
 % no point in checking their packing density