Fully specified shapes are compatible with other fully specified shapes only if their rank, dimensions, and layout are identical. Fully specified shapes are compatible with Partially specified shapes if their ranks are identical.
Partially specified shapes are compatiable with other Partially specified shapes if their ranks are identical.
Fully unspecified shapes are compatible with all other shape types.
shape [10]S;
float:S a,b; /* parallel floats of shape S */
...
a = b; /* copy all values in pvar "b" into pvar "a" */
b = b + a; /* add all values of pvar "a" to pvar "b" and store into "b" */
b += a; /* same as above */
...
float:S x[5] /* array of 5 parallel float of shape S */
...
for ( i = 0; i < 5; i++ )
x[i] = i+1;
/* yields : Parallel elements
x[0] 1 1 1 1 1 1 1 1 1 1
x[1] 2 2 2 2 2 2 2 2 2 2
x[2] 3 3 3 3 3 3 3 3 3 3
x[3] 4 4 4 4 4 4 4 4 4 4
Parallel variables may be referenced in their entirety, as above, as
sliced expressions or as scalar objects. Whenever a parallel variable
is to be referenced in a way other then the whole variable, the index
notation must appear on the left hand side of the parallel variable in
order to differentiate from array indexing (which occurs on the right
hand side of the parallel variable):
[4]x[2] /* refers to int at the 4-th parallel position in
array element x[2] */
Storing into individual parallel elements can be inefficient. Most references
of parallel variables should use all or most of the parallel variable.
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