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How to Calculate BMI using Action Button

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Last Post by Anonymous 1 second ago

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acantu

(@acantu)

Posts: 722

Prominent Member

Topic starter

I have tried using this:

Action Buttom -> Calculate

{OBSNOW("Weight") / ( OBSNOW("Height") * OBSNOW("Height") ) * 703}

but doesn't work, can someone help. Thanks.

Posted : December 13, 2012 2:49 am

gibsonmi

(@gibsonmi)

Posts: 827

Prominent Member

observations are stored as strings, try this to convert the strings to values

{val(OBSNOW("Weight")) / ( val(OBSNOW("Height")) * val(OBSNOW("Height")) ) * 703}

or you could use this function

{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 : December 13, 2012 6:02 am

acantu

(@acantu)

Posts: 722

Prominent Member

Topic starter

Thanks, worked.

Posted : December 14, 2012 1:09 am

chrishuff1

(@chrishuff1)

Posts: 201

Reputable Member

acantu said:

Thanks, worked.

I know this is answered already but here's a shorter version that is setup in the whiteboard area...

{fn CalcBMI(){

   IF (OBSNOW("WEIGHT") == "" OR OBSNOW("HEIGHT") == "") THEN
      return ""
   ENDIF

return round((OBSNOW("WEIGHT") / 2.2046) / ((OBSNOW("HEIGHT") / 39.3701) ^2),2)
}}

Posted : December 18, 2012 2:03 am

acantu

(@acantu)

Posts: 722

Prominent Member

Topic starter

Thanks, but why is it when i try to assign this to a button, i get the following error:

"Internal or unpaired braces are not allowed in the calculation expression. Please correct."

Posted : December 20, 2012 12:54 am

gibsonmi

(@gibsonmi)

Posts: 827

Prominent Member

set the field to RUNPROCESS

Posted : December 20, 2012 12:56 am

acantu

(@acantu)

Posts: 722

Prominent Member

Topic starter

gibsonmi said:

set the field to RUNPROCESS

Now i get

"You cannot use brackets or carriage returns in the highlighted field. Please correct."

Posted : December 20, 2012 1:00 am

acantu

(@acantu)

Posts: 722

Prominent Member

Topic starter

Nevermind, got it working. Thanks.

Posted : December 20, 2012 1:11 am

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