checking the existense of Matrix static vars

[bobpit]

When I do StaticVarGet("myvar"), how can I be sure that I have read a valid static variable, when "myvar" is a matrix?


If the static var is a number, then the code would be:

StaticVarRemove( "myvar");
x1 = 18; // number
StaticVarSet( "myvar" , x1);
x2 = Nz(StaticVarGet("myvar"));


However, if the static var is a Matrix, the following code does snot work:
StaticVarRemove( "myvar");
x1 = Matrix( 4,5,-5);  // matrix
StaticVarSet( "myvar" , x1);
x2 = Nz(StaticVarGet("myvar"));


So how can I check that x2 is not null and I actually have a static variable in x2?

[fxshrat]

For example you may use typeof operator for checking for type matrix.

if( typeof( mat ) == "matrix" ){
   // do something
} else {
   // else do something else
}

And FYI, Nz is not a matrix function. It operates on numbers (-> matrix elements) or arrays.

[bobpit]

typeof() works! Thank you very much.

Here is sample code:

StaticVarRemove( "myvar");
x1 = Matrix( 400,5,-5);
// x1 = 18; // number
StaticVarSet( "myvar" , x1);
x2 = StaticVarGet("myvar");

"Typeof(x2) : " + typeof( x2);
if (typeof( x2)=="matrix")
printf("Success !!!\n");


 
"All variables in memory: " + StaticVarInfo( "myvar", "list" );
" Total static var memory: " + StaticVarInfo( "myvar", "totalmemory");
" Memory (bytes): " + StaticVarInfo( "myvar", "memory" );