MB I sometimes want to compute the size which is required by a multi-dimensionnal array. Now the arraybytesize package does the computation for me :
The single thing to remember is the map from basic data types to the number of bytes required to store them. The following is the map used in arraybytesize :
shortinteger (8 bits) : 2 bytes integer (32 bits) : 4 bytes longinteger (32 bits) : 4 bytes longlonginteger (64 bits) : 8 bytes singlereal (32 bits) : 4 bytes doublereal (64 bits) : 8 bytes
The following is an example of a basic use of the "bytesize" method. The memory needed to store a 3500 x 3500 integer matrix is equal to 49.0 MB (which is more human-readable than 49000000 bytes isn'it ?).
set myarray [arraybytesize create %AUTO%] $myarray configure -rank 2 $myarray configure -verbose 1 $myarray setdimension 0 3500 $myarray setdimension 1 3500 set size [$myarray size] set bytesize [$myarray bytesize] set hrbytesize [$myarray bytesize 1] $myarray destroy