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Declare a variable local to each GFOR iteration
Usage
| Jacket for M Language |
| | Supported Syntax |
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gfor i = 1:n
a = local(i, A); % create local copy
a(i) = 0; % each tile writes '0' in different position
...
gend |
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GFOR Supported
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Yes
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GCOMPILE Supported
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No
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Types Supported
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- GDOUBLE GSINGLE GLOGICAL GINT32 GINT8 GUINT32 GUINT8 COMPLEX
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Types Not Supported
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-
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| More Details |
This function is available with Jacket development builds following 20 Dec 2011, and packaged in Jacket versions 2.1 and above.
Use LOCAL to indicate when a variable is unique to each iteration, i.e. each iteration has its own copy of the data for modification independent of other iterations.
For example, when using the equal sign, Jacket thinks you are subscripting into B shared by all iterations:
n = 5;
A = gsingle(1:n);
gfor ii = 1:n
B = A; % fake copy
B(ii) = 0; % write zeros in positions '1:n' of original matrix
C(ii) = sum(B);
gend
C % all zeros (==gzeros(1,n)) Compare that to indicating local copies:
A = gsingle(1:n);
gfor ii = 1:n
B = local(ii,A); % create local copy
B(ii) = 0; % each tile has its own B with a different index zeroed out
D(ii) = sum(B); % different sum for each tile
gend
D % all unique summations Produces:
C =
0
0
0
0
0
D =
14
13
12
11
10
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See Also
GFOR