Update: Although because of the (greatly complicated) Perl module that this script is reliant on I wasn't able to try a lot of the suggestions, a simple modification has reduced the incidence of the problem to a much more acceptable level (now about 1 in 8 of the times the script is run). The modification is as follows: 
   $R_send_0 = "$R_comment_out$R_line0";
    $R_send_1 = "$R_line1$R_line2$R_line3$R_line4$R_line5";
    $R_send_2 = "$R_dblquotation_start$R_line6$R_send_3";

my $r_send_comment = $R_send_0;
my $r_send_string = $R_send_1;
my $r_send_string2 = $R_send_2;
$R->send (qq'$r_send_string');
$R->send (qq'$r_send_string2');
my $ret = $R->read;
push (@R_output_store, $r_send_comment);
push (@R_output_store, $ret);
print $ret;
print "\n\n";

[download]
has been changed to: 
$R_send_0 = "$R_comment_out$R_line0";
    $R_send_1 = "$R_line1$R_line2$R_line3$R_line4$R_line5";
    $R_send_2 = "$R_dblquotation_start$R_line6$R_send_3";
    $R_send = "$R_send_1\n$R_send_2";


my $r_send_comment = $R_send_0;
my $r_send_string = $R_send;
$R->send (qq'$r_send_string');
push (@R_output_store, $r_send_comment);
print $r_send_comment;
print "\n";
my $ret = $R->read;
push (@R_output_store, $ret);
print $ret;
print "\n\n";

[download]
The program as I say is still not completely free of problems. The freezing continues to occur at a low frequency, and a warning message of the form: 'Warning Message: cannot open file 'input.4.r' is sometimes displayed at the end of the screen-printed output.

In reply to Re^3: Peculiar Perl/R Problem - Memory? by maybeD
in thread Peculiar Perl/R Problem - Memory? by maybeD

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