Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
ScilabEval
tcl instruction : Evaluate a string with scilab interpreter
Syntax
ScilabEval instruction ScilabEval instruction "seq" ScilabEval instruction "sync" ScilabEval instruction "sync" "seq" ScilabEval "flush"
Arguments
- instruction
tcl string character contains a Scilab instruction to evaluate with the current Scilab interpreter.
Description
This function must be called in a tcl/tk script executed from Scilab. It allows to associate Scilab actions to tcl/tk widgets (graphic objects) or to use Scilab to perform some computations within a tcl script.
- ScilabEval instruction
If the
ScilabEval instruction
syntax is used, theinstruction
is first stored in a FIFO queue,ScilabEval
returns immediately. Scilab executes the queuedinstructions
when possible (it should be at the prompt but also at the end of each instructions of the currently running function) in the order they were submitted. This syntax can be used to associate Scilab actions to tcl/tk widgets but not into a tcl script executed by TCL_EvalFile or TCL_EvalStr because in this situation the Scilab interpreter is blocked up to the end of the script. Note that with theScilabEval instruction
syntax, if there are manyScilabEval
commands stored in the queue the execution of the second one can be started in the middle of the execution of the first one (in particular if the first one contains more than a simple expression).If the
"seq"
option is added, the associated instruction evaluation should be finished (or paused) before the next queued instruction evaluation can be started. The next callback stored in the command queue will only be taken into account when the current one will be finished or paused.- ScilabEval instruction "sync"
If the
ScilabEval instruction "sync"
syntax is used, the instruction is executed immediately (not queued) and theScilabEval
returns when theinstruction
evaluation is finished. The scilabinstruction
evaluation may be interrupted by new or queued commands.If the
"seq"
option is added, the associated instruction evaluation should be finished (or paused) before any queued instruction evaluation can be started. The scilabinstruction
evaluation may not be interrupted by new or queued commands (except if it is paused).- ScilabEval "flush"
If the
ScilabEval "flush"
syntax is used, all the previously queuedinstructions
are executed immediately and the ScilabEval returns when the execution is finished. Eachinstruction
is executed with the option used at the time of queuing up (i.e.seq
or no option).
The evaluation context of all these cases is the current Scilab context
when theinstruction
evaluation starts.
More information about Tcl/Tk: http://www.tcl.tk/doc/
Examples
//Callbacks and "seq" option usage //create tcl instructions tcl_script=['toplevel .w1' 'button .w1.b -text ""Click here to execute without seq option"" -command WithoutSeq' 'button .w1.b1 -text ""Click here to execute with seq option"" -command WithSeq' 'pack .w1.b .w1.b1' 'proc WithoutSeq {} { '; ' ScilabEval ""cont=%f;;cont=%t;"" ' ' ScilabEval ""if cont then disp(''ok''),else disp(''wrong'');end;cont=%f;"" ' '}' 'proc WithSeq {} { '; ' ScilabEval ""cont=%f;;cont=%t;"" ""seq""' ' ScilabEval ""if cont then disp(''ok''),else disp(''wrong'');end;cont=%f;"" ' '}']; mputl(tcl_script,TMPDIR+'/test.tcl') //write them to a file // Execute the tcl script cont=%f; TCL_EvalFile(TMPDIR+'/test.tcl');; //scripts and "sync" option usage //----------------without "sync"---------------- tcl_script=[' set t ""0""' ' while {$t != ""10""} {' ' ScilabEval ""a=$t;mprintf(''%d '',a);""' ' incr t' ' }']; mputl(tcl_script,TMPDIR+'/test.tcl') //write them to a file // Execute the tcl script TCL_EvalFile(TMPDIR+'/test.tcl');mprintf('TCL_EvalFile finished\n'); // The ScilabEval are executed after the and of TCL_EvalFile //----------------with "sync"---------------- tcl_script=[' set t ""0""' ' while {$t != ""10""} {' ' ScilabEval ""a=$t;mprintf(''%d '',a);"" ""sync""' ' incr t' ' }']; mputl(tcl_script,TMPDIR+'/test.tcl') //write them to a file // Execute the tcl script TCL_EvalFile(TMPDIR+'/test.tcl');mprintf('TCL_EvalFile finished\n'); // The ScilabEval are executed synchronously with TCL_EvalFile
See also
- TCL_EvalFile — Reads and evaluate a tcl/tk file
- TCL_EvalStr — Evaluate a string within the Tcl/Tk interpreter
- TCL_GetVar — Get a tcl/tk variable value
- TCL_SetVar — Set a tcl/tk variable value
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