retreiving variables efficiently

[shaeffer]

Hello,
If I want to use only the current values of the variables vADV and vDECL in a calculation, is Case 1 below just as efficient (in terms of computer resources) as Case 2 for getting those values? Would Case 1 be even more efficient for any reason?

I understand that case 2 retreives each series, so would Case 2 only be needed if I also needed the ___.getValue(-1) values for my calculation as well?

Thanks
shaeffer

//--- CASE 1 --------------------------------------------------
function main() {

var vADV;
var vDECL;

    vADV  = close(0, sym("$ADV")); 
    vDECL = close(0, sym("$DECL"));

//--- CASE 2 ----------------------------------------------------------- 

var xADV  = null;
var xDECL = null;
var bInit = false;

function main(){

var vADV;
var vDECL;

    if(bInit == false){
        xADV  = close(sym("$ADV"));
        xDECL = close(sym("$DECL"));
        bInit = true;
    }

vADV  =  xADV.getValue(0)
vDECL =  xDECL.getValue(0)

//--------------------------------------------------------------- 

[ACM]

Re: retreiving variables efficiently

shaeffer
Case 2 of your examples is more efficient because while you are creating a series in either case in the first one the efs engine has to check on each iteration if that series already exists so as not to create another instance of it. By using the bInit [or similar] routine you preempt the efs engine from having to perform those checks thereby increasing the efficiency of execution of the script
Alex

Originally posted by shaeffer
Hello,
If I want to use only the current values of the variables vADV and vDECL in a calculation, is Case 1 below just as efficient (in terms of computer resources) as Case 2 for getting those values? Would Case 1 be even more efficient for any reason?

I understand that case 2 retreives each series, so would Case 2 only be needed if I also needed the ___.getValue(-1) values for my calculation as well?

Thanks
shaeffer

//--- CASE 1 --------------------------------------------------
function main() {

var vADV;
var vDECL;

    vADV  = close(0, sym("$ADV")); 
    vDECL = close(0, sym("$DECL"));

//--- CASE 2 ----------------------------------------------------------- 

var xADV  = null;
var xDECL = null;
var bInit = false;

function main(){

var vADV;
var vDECL;

    if(bInit == false){
        xADV  = close(sym("$ADV"));
        xDECL = close(sym("$DECL"));
        bInit = true;
    }

vADV  =  xADV.getValue(0)
vDECL =  xDECL.getValue(0)

//--------------------------------------------------------------- 

[shaeffer]

Re: Re: retreiving variables efficiently

Originally posted by Alexis C. Montenegro
shaeffer
Case 2 of your examples is more efficient because while you are creating a series in either case in the first one the efs engine has to check on each iteration if that series already exists so as not to create another instance of it. By using the bInit [or similar] routine you preempt the efs engine from having to perform those checks thereby increasing the efficiency of execution of the script
Alex

Thanks Alex,
I did not realize that Case 1 was also creating a series (as apposed to simply getting the latest value). I'll fix up my efs's accordingly.
Regards
shaeffer

[ACM]

Re: Re: Re: retreiving variables efficiently

shaeffer
You are welcome.
FWIW if you search the forums you will find several threads on this topic as it has been discussed at length before
Alex

Originally posted by shaeffer
Thanks Alex,
I did not realize that Case 1 was also creating a series (as apposed to simply getting the latest value). I'll fix up my efs's accordingly.
Regards
shaeffer

[shaeffer]

Re: Re: retreiving variables efficiently

Originally posted by Alexis C. Montenegro
shaeffer
..... By using the bInit [or similar] ......
Alex

Hello Alex,
I've fixed up a few of my efs's per your earlier reply, but then arrived at this one used for plotting daily moving averages on intraday charts.

It looks to me like line 86 is acheving the same as the bInit in Case 2 below, or does this still need an efficiency tune-up?

Regards
shaeffer

[ACM]

Re: Re: Re: retreiving variables efficiently

shaeffer
It is essentially the same
Alex

Originally posted by shaeffer
Hello Alex,
I've fixed up a few of my efs's per your earlier reply, but then arrived at this one used for plotting daily moving averages on intraday charts.

It looks to me like line 86 is acheving the same as the bInit in Case 2 below, or does this still need an efficiency tune-up?

Regards
shaeffer