comparison toolboxes/FullBNT-1.0.7/bnt/potentials/Tables/mult_by_table2.m @ 0:e9a9cd732c1e tip

first hg version after svn

+function bigT = mult_by_table2(bigT, bigdom, bigsz, smallT, smalldom, smallsz)
+% MULT_BY_TABLE 
+% bigT = mult_by_table(bigT, bigdom, bigsz, smallT, smalldom, smallsz)
+%
+
+%Ts = extend_domain_table(smallT, smalldom, smallsz, bigdom, bigsz);
+%bigT(:) = bigT(:) .* Ts(:); % must have bigT(:) on LHS to preserve shape
+
+% extend_domain_table has a lot of overhead for small tables,
+% since it calls myreshape and myrepmat, which check for 1 dimensional case.
+% Here, we check up front.
+
+if length(bigdom)==1 % vector
+  bigT = bigT .* smallT; % smallT can be scalar or vector
+else
+  if (length(bigsz) == length(smallsz)) & all(bigsz == smallsz)
+    bigT = bigT .* smallT;
+  else
+    map = find_equiv_posns(smalldom, bigdom);
+    sz = ones(1, length(bigdom));
+    sz(map) = smallsz;
+    smallT = reshape(smallT, sz); % add dimensions of size 1 for missing domain
+    % we can use reshape instead of myreshape, because we know length(sz)>1
+    sz = bigsz;
+    sz(map) = 1; % don't replicate along small domain, which is shared
+    % we can use repmat instead of myrepmat, because we know length(sz)>1
+    smallT = repmat(smallT, sz(:)');
+    bigT(:) = bigT(:) .* smallT(:);
+  end
+end