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BMI calculation question

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Last Post by Adam Daniel 10 years ago

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Adam Daniel

(@adaniel)

Posts: 524

Prominent Member

Topic starter

We currently use a button to fun a function to calculate and then populate a edit field tied to BMI. I know there's a way to do this automatically such as when OBSANY("HIEGHT") <> "" and OBSNOW("WEIGHT") <> "" then OBSNOW("BMI") == the calculation. I'm just stumped right now. I've even tried the example VFE comes with and it throws a massive error. Any help or solution would be great.

Thanks in advance.

Posted : May 29, 2014 12:37 am

chrishuff1

(@chrishuff1)

Posts: 201

Reputable Member

Here my function in the whiteboard…

{fn CalcBMI(){
   IF (OBSNOW("WEIGHT") == "" OR OBSNOW("HEIGHT") == "") THEN
      return ""
   ENDIF
   return round((OBSNOW("WEIGHT") / 2.2046) / ((OBSNOW("HEIGHT") / 39.3701) ^2),2)
}}

Posted : May 29, 2014 1:27 am

Adam Daniel

(@adaniel)

Posts: 524

Prominent Member

Topic starter

How is it being push to the OBS term BMI

Posted : May 29, 2014 1:44 am

chrishuff1

(@chrishuff1)

Posts: 201

Reputable Member

Through your button.

Set the button to CALCULATION with the target item of BMI and {CalcBMI()} listed in the text box below...

Posted : May 29, 2014 1:45 am

Adam Daniel

(@adaniel)

Posts: 524

Prominent Member

Topic starter

Ah that's the way it's set up now. I'm looking for a way to have a data display that will automatically do the calculation once a height and weight are entered. I've gotten it to do the calculation automatically just can't figure how to push it to the OBS.

I used this in the data display MEL expression:

{
if (OBSNOW(
"WEIGHT") == "" or OBSANY("HEIGHT") == "" or OBSANY("HEIGHT") <= 0) then ""
else (OBSNOW(
"WEIGHT") / 2.2) / ((OBSANY("HEIGHT") / 39.4) ^ 2)
endif
}

Now to figure out how to push that to the OBS.

Posted : May 29, 2014 1:55 am

chrishuff1

(@chrishuff1)

Posts: 201

Reputable Member

adaniel said:

Ah that's the way it's set up now. I'm looking for a way to have a data display that will automatically do the calculation once a height and weight are entered. I've gotten it to do the calculation automatically just can't figure how to push it to the OBS.

I used this in the data display MEL expression:

{
if (OBSNOW(
"WEIGHT") == "" or OBSANY("HEIGHT") == "" or OBSANY("HEIGHT") <= 0) then ""
else (OBSNOW(
"WEIGHT") / 2.2) / ((OBSANY("HEIGHT") / 39.4) ^ 2)
endif
}

Now to figure out how to push that to the OBS.

Not sure what exact coding would be but I'd assume something like :

...If...then...ELSE obsnow("bmi")=(OBSNOW("WEIGHT") / 2.2) / ((OBSANY("HEIGHT") / 39.4) ^ 2)

Posted : May 29, 2014 1:58 am

DavidShower

(@davidshower)

Posts: 1255

Noble Member

obsnow("bmi",(OBSNOW("WEIGHT") / 2.2) / ((OBSANY("HEIGHT") / 39.4) ^ 2))

Posted : May 29, 2014 2:05 am

Adam Daniel

(@adaniel)

Posts: 524

Prominent Member

Topic starter

Tried both here's what I get

{/*VARIABLES FOR MEL BUILT-IN SYMBOLS USED IN FORM*/
<-VOID{global F5825_786_1401381537 = OBSANY("HEIGHT") "" <-VOID200{
/*FUNCTION DEFINITIONS*/
<-VOID{/*START OF FORM TRANSLATION BODY*/
<-VOIDHt: 70
Wt: 200

Using this in the data display:

{
if (OBSNOW("WEIGHT") == "" or OBSANY("HEIGHT") == "" or OBSANY("HEIGHT") <= 0) then ""
else (OBSNOW("bmi",(OBSNOW("WEIGHT") / 2.2) / ((OBSANY("HEIGHT") / 39.4) ^ 2)))
endif
}

Posted : May 29, 2014 2:40 am

chrishuff1

(@chrishuff1)

Posts: 201

Reputable Member

If you look above that you get the real error:

{global F3477_70_1401386969 = OBSNOW("WEIGHT") "" <-INVALID OPERATION OR BAD SYMBOL TYPE: OBSNOW{if (F3477_70_1401386969 == "" or F3477_40_1401386969 == "" or F3477_40_1401386969 <= 0) then ""
else (OBSNOW("bmi",(F3477_70_1401386969 / 2.2) / ((F3477_40_1401386969 / 39.4) ^ 2)))
endif <-INVALID OPERATION OR BAD SYMBOL TYPE: OBSNOW

I'm not sure if you CAN have it auto populate. Not to be rude, but is it that hard to press a button?

Posted : May 29, 2014 4:13 am

gibsonmi

(@gibsonmi)

Posts: 827

Prominent Member

Ours does, set the BMI field to document connection with BODY_MASS_IN as the variable name and post the code below on the white board.

/*Document variable setting for vitals*/
{DOCUMENT.TEMP_veHEIGHTNOW = DOCUMENT.Height}
{DOCUMENT.TEMP_veHEIGHTPREV = OBSPREV("Height")}
{DOCUMENT.TEMP_veWEIGHTNOW = DOCUMENT.Weight}

{DOCUMENT.BODY_MASS_IN = str(CalcBMIConv(DOCUMENT.TEMP_veHEIGHTNOW,DOCUMENT.TEMP_veHEIGHTPREV,DOCUMENT.TEMP_veWEIGHTNOW))
OBSNOW("BMI",DOCUMENT.BODY_MASS_IN)}

{fn CalcBMIConv(heightnow,heightprev,weightnow) {
local heightval = ""

cond
case heightnow <> ""
heightval = heightnow
case heightprev <> ""
heightval = heightprev
else
heightval = ""
endcond

if weightnow == "" or heightval == "" or val(weightnow) == 0 or val(heightval) == 0 then
return ""
endif

if heightval == 0 then
return str(0)
endif

return str((weightnow / 2.2) / ((heightval / 39.4)^2))

}}

Posted : May 29, 2014 4:23 am

Adam Daniel

(@adaniel)

Posts: 524

Prominent Member

Topic starter

chrishuff1 said:

If you look above that you get the real error:

{global F3477_70_1401386969 = OBSNOW("WEIGHT") "" <-INVALID OPERATION OR BAD SYMBOL TYPE: OBSNOW{if (F3477_70_1401386969 == "" or F3477_40_1401386969 == "" or F3477_40_1401386969 <= 0) then ""
else (OBSNOW("bmi",(F3477_70_1401386969 / 2.2) / ((F3477_40_1401386969 / 39.4) ^ 2)))
endif <-INVALID OPERATION OR BAD SYMBOL TYPE: OBSNOW

I'm not sure if you CAN have it auto populate. Not to be rude, but is it that hard to press a button?

I understand just a request that I'm trying to fulfil

Posted : May 29, 2014 4:55 am

DavidShower

(@davidshower)

Posts: 1255

Noble Member

We have obsnow("bmi") in the data display and here is our watcher pane code (which is REALLY close to Michael's - we set HEIGHT and WEIGHT obs terms directly on the form):

{!global gHEIGHT = OBSNOW("Height")}
{!global gWEIGHT = OBSNOW("Weight")}

{!global gHEIGHTPREV = OBSPREV("Height")}

{!IF (gHEIGHT<>"" OR gHEIGHTPREV<>"") AND gWEIGHT<>"" THEN 
	DOCUMENT.BODY_MASS_IN = str(CalcBMIConv(gHEIGHT,gHEIGHTPREV,gWEIGHT))
 	if  DOCUMENT.BODY_MASS_IN <> "" THEN OBSNOW("BMI",DOCUMENT.BODY_MASS_IN) ELSE OBSNOW("BMI","") ENDIF
ELSE "" ENDIF}

{fn CalcBMIConv(heightnow,heightprev,weightnow) {
local heightval = ""

cond
 case heightnow <> "" 
  heightval = heightnow
case heightprev <> "" and heightnow = "" 
  heightval = heightprev
else
  heightval = ""
endcond

if weightnow == "" or heightval == "" then
  return ""
endif

if heightval == 0 then
  return str(0)
endif

return str((weightnow / 2.2) / ((heightval / 39.4)^2))

}}

Posted : May 29, 2014 5:44 am

Adam Daniel

(@adaniel)

Posts: 524

Prominent Member

Topic starter

Works just like I was thinking it could. Thank you all.

Posted : May 29, 2014 5:45 am

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