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Bivariate list condition

AdamChoen

I'm looking for a condition to start a loop that handles the Bivariate title,

I found one that works only if I have more the 1 chart.

lst = dt << Bivariate(
.
.
.
.
);

If(IsList(lst) & (nn = NItems(lst)),
	For(i = 1, i <= nn, i++,
.
.
.
.
);

I cant find a condition to distinguish between 0 (no chart == dt table is empty) to 1 (only one chart is created).

any help is welcomed

Accepted answers

txnelson

The Try() function can be used in many, many ways to keep code from failing, and also to determine is code was properly executed. Here is just one simple way to illustrate it's use

Names Default To Here( 1 );
dis = Try(
	dt << Distribution( Continuous Distribution( Column( :height ) ) ),
	"not found"
);
If( dis == "not found",
	Dialog( "No Table Produced" )
);

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
dis = Try(
	dt << Distribution( Continuous Distribution( Column( :height ) ) ),
	"not found"
);
If( dis == "not found",
	Dialog( "No Table Produced" )
);

All comments

txnelson

Your description is a bit vague to suggest specific solutions. I suggest you look into

isEmpty(),

N Cols()

and

Try()

as potential functions that can detect the missing charts.

AdamChoen

thanks, Jim
Eventually I used a simple condition Nrows(dt) > 0 to check if the table is empty, not the smartest one but it works.

how can i use the try() function to check if i have 1 or 0 charts in my parameter "lst" ?

txnelson

The Try() function can be used in many, many ways to keep code from failing, and also to determine is code was properly executed. Here is just one simple way to illustrate it's use

Names Default To Here( 1 );
dis = Try(
	dt << Distribution( Continuous Distribution( Column( :height ) ) ),
	"not found"
);
If( dis == "not found",
	Dialog( "No Table Produced" )
);

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
dis = Try(
	dt << Distribution( Continuous Distribution( Column( :height ) ) ),
	"not found"
);
If( dis == "not found",
	Dialog( "No Table Produced" )
);

AdamChoen

Ok! so that can definitely help.
Thanks!