Initialize one time with Nz and Staticvar IS working fine

[DSK]

Hello All,

I am trying to initialize a variable during 1st run and wrote below code to test. It is not working (i.e. It is not executing printf statement inside IF). Appreciate your inputs.

_SECTION_BEGIN("Test1");

SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorDefault ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 

printf("Before IF\n");

if(Nz(StaticVarGet(Name()+"c1")) == 0)
{
StaticVarSet( Name()+"c1",1);
printf("Inside IF\n");
}

printf("After IF\n");

_SECTION_END();

Thanks
Shiva

Moderator comment: the code works absolutely fine. The only mistake that OP is doing is not knowing how to debug and how to use TRACE

To get better understanding of what is happening in your code and how functions work, use advice given here: How do I debug my formula?

[fxshrat]

That printed text inside your if statement is visible for a blink of an eye only.
Printf does not record text.
Use _Trace function instead to record messages.
http://www.amibroker.com/guide/afl/_trace.html

[Cougar]

It did work for first time only.

So, you need to remove that StaticVar for the code inside it to be executed again. Also, learn the usage of * as mentioned in StaticVarRemove.

Having that said, do not keep that StaticVarRemove in your code all the time. That would be like shooting yourself in the foot and the intention of "Execute that Once" won't be served.

[PanoS]

Hi
If you like the static var to start from zero you should write with this way
Nz(StaticVarGet(Name()+"c1")),0)

[fxshrat]

@PanoS

Nz(StaticVarGet(Name()+"c1")),0)

Default value is zero already!

---

@DSK

I am trying to initialize a variable during 1st run

@Cougar

So, you need to remove that StaticVar for the code inside it to be executed again.

???

[PanoS]

I was thinning is Empty

[Cougar]

@fxshrat

???

Already mentioned:

@Cougar

It did work for first time "only".

We do not know what OP is doing there or thinking.

---

@PanoS

I was thinning is Empty

Empty != Null

Empty (or "") applies to StaticVarSetText or StaticVarGetText like an empty string, and, Null applies to StaticVarSet or StaticVarGet kind of similar to should be a number instead NaN (Not a Number).

[fxshrat]

@PanoS

I was thinning is Empty

Default ValueIfNull of Nz function is zero.
Look it up
http://www.amibroker.com/guide/afl/nz.html

[fxshrat]

@Cougar

We do not know what OP is doing there or thinking.

Read first sentence

@DSK

I am trying to initialize a variable during 1st run

And answer how to record has been given in 2nd post already.
Printf does not record, _trace does.
So I don't what's still to discuss.

[Cougar]

@fxshrat

So I don't what's still to discuss.

It is about visibility here and clear (all) facts.

P.S. I read that line that you disrespectfully wrote, then edited.

[fxshrat]

@Cougar

It is about visibility here and clear (all) facts.

You seem to have reading problems.
Once again read first sentence of first post.
Then read second post of this thread in regards to visibility of text when trying to initialize one time.

Of course you could do non sense like this

if(Nz(StaticVarGet(Name()+"c1")) == 0)
{
    StaticVarSet( Name()+"c1",1);
    StaticvarSetText("InsideIf", "Was executed inside IF\n");
}

printf(StaticvarGetText("InsideIf"));

[fxshrat]

@fxshrat

Of course you could do non sense like this

Or just ...

var = Nz(StaticVarGet(Name()+"c1"));

if (var == 0) {
	StaticVarSet( Name()+"c1",1);	
}

// Check outside of 'if' statement
printf("%s", StrExtract("Not initialized,Was initialized", var));

[Cougar]

@fxshrat

Of course you could do non sense like this

if(Nz(StaticVarGet(Name()+"c1")) == 0)
{
    StaticVarSet( Name()+"c1",1);
    StaticvarSetText("InsideIf", "Was executed inside IF\n");
}

printf(StaticvarGetText("InsideIf"));

True!

Would be no non-sensical, if written like this:

// https://forum.amibroker.com/t/initialize-one-time-with-nz-and-staticvar-not-working/34917/11
// Edited by Cougar

EnableTextOutput( 0 );

chartId = Name() + GetChartID();

execChk = Nz( StaticVarGet( "execChk" + chartId ) );
if( !execChk ) {
    StaticvarSetText( "insideIf" + chartId, "Greetings from inside\n" );
    StaticVarSet( "execChk" + chartId, 1 );
}

insideIfStr = StaticVarGetText( "insideIf" + chartId );

And I was referring to something like this "only" during development (not in production) just to reset StaticVars:

EnableTextOutput( 0 );

chartId = Name() + GetChartID();

// StaticVarRemove( "execChk" + chartId );
execChk = Nz( StaticVarGet( "execChk" + chartId ) );
if( !execChk ) {
    StaticvarSetText( "insideIf" + chartId, "Greetings from inside\n" );
    StaticVarSet( "execChk" + chartId, 1 );
}

insideIfStr = StaticVarGetText( "insideIf" + chartId );

---

@fxshrat

Then read second post of this thread in regards to visibility of text

I read that when you posted it, did not fuzz! However, since you insist, re-read and replying now.

Probably, someone here does need to revisit that good old printf function reference.

printf and StrFormat behave identically except that printf writes output to the window, while StrFormat does not write anything to output window but returns resulting string instead.

---

@fxshrat

Printf does not record text.

That statement is not correct.

@fxshrat

Or just ...

printf( string ) works, so does printf( "%s", string )!

---

---

P.S.

@fxshrat

You seem to have reading problems.

I knew @fxshrat - The Perfectionist, did not know turned to a virtual Ophthalmologist as well. Thanks for the advice, for now I can read well (especially stuff written between lines).

[fxshrat]

@Cougar

That statement is not correct.

Of course it is correct.

Just current text output (of current AFL run) is seen in interpretation window but no past one.
Interpretation window output is not keeping memory of old text output been printed within an 'if' statement returning true (single time). So most of the time you can't see it because execution is too fast and just being viewable within blink of an eye (re-read 2nd post of this thread once again). Text of if statement being executed before is not "recorded" there (not being kept in Interpretation window).

On the other hand _trace writes to debug viewer where (all) past recorded output can be viewed.
All records are kept there.

---

@Cougar

@fxshrat

Or just ...

printf( string ) works, so does printf( "%s", string )!

Huh, what's your message?

[fxshrat]

@Cougar

Would be no non-sensical, if written like this:

// https://forum.amibroker.com/t/initialize-one-time-with-nz-and-staticvar-not-working/34917/11
// Edited by Cougar

EnableTextOutput( 0 );

chartId = Name() + GetChartID();

execChk = Nz( StaticVarGet( "execChk" + chartId ) );
if( !execChk ) {
    StaticvarSetText( "insideIf" + chartId, "Greetings from inside\n" );
    StaticVarSet( "execChk" + chartId, 1 );
}

insideIfStr = StaticVarGetText( "insideIf" + chartId );

Thanks for the laugh.
As usual it is just repetition of already written code.
Whether adding chartID or not is up to the user of first post.
It is rather about making printf to output text kept in memory.

Now take another one hour or two ones to write long essay.

[Cougar]

@fxshrat

Printf does not record text.

@fxshrat

Printf does not record, _trace does.

As mentioned printf behaves identically like StrFormat. Do not steer this to printf vs _TRACEF! This thread was never meant to be so.

If StaticVarSet inside an one-time executed code, unless reset, won't execute that inside code again. Does not matter whether you use printf or _TRACEF or _TRACE.

Sometimes, it is better to swallow rather than frantically throwing at others.

@fxshrat

Now take another one hour or two ones to write long essay.

I wonder how you lost that old dignity of yours. Sorry, you're making fun of yourself!

[fxshrat]

@Cougar

Do not steer this to printf vs _TRACEF! This thread was never meant to be so.

Troll of the month or what?

@DSK

It is not executing printf statement inside IF)

[Cougar]

@fxshrat

Troll of the month or what?

Remember, you started it with:

@fxshrat

???

This was posted:

Initialize one time with Nz and Staticvar not working

It did work for first time only. So, you need to remove that StaticVar for the code inside it to be executed again. Also, learn the usage of * as mentioned in StaticVarRemove. Having that said, do not keep that StaticVarRemove in your code all the time. That would be like shooting yourself in the foot and the intention of "Execute that Once" won't be served.

Because:

@Cougar

If StaticVarSet inside an one-time executed code, unless reset, won't execute that inside code again. Does not matter whether you use printf or _TRACEF or _TRACE.

And you're unnecessarily dragging it to printf vs _TRACEF wherein the conversation was never meant to be so.

[fxshrat]

@Cougar

Having that said, do not keep that StaticVarRemove in your code all the time. That would be like shooting yourself in the foot and the intention of "Execute that Once" won't be served.

Been added after my question marks.
Besides there is no need for using Staticvarremove anyway.

@Cougar

And you're unnecessarily dragging it to printf vs _TRACEF wherein the conversation was never meant to be so.

Yes, because of first post. All that matters.

[Cougar]

Did not know, one can turn mean just to prove their point. Anyways, good social learning!