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How to get lowest 5 values from a field list?

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    #1

    How to get lowest 5 values from a field list?

    Greetings all,

    I have not been able to figure out how to do this. It seems with all the power in Alpha I am just missing something. Hopefully someone can help.

    I have a form that has 7 fields populated with test results. I want to have a calculated field that totals the 5 lowest test results.

    So...

    Field Names - Value
    TestResult1 = 100
    TestResult2 = 51
    TestResult3 = 52
    TestResult4 = 53
    TestResult5 = 54
    TestResult6 = 99
    TestResult7 = 50

    I would like to sum the 5 lowest values into a calc field. So from above, that would be 51+52+53+54+50. The 100 and the 99 are omitted from the calculation.


    Any ideas?

    Regards,

    Jeff
    Tags: None
    #2
    Re: How to get lowest 5 values from a field list?

    This is a bit clumsy but it should work.

    Code:
    FUNCTION sum_five_lowest AS N (v1 AS N, v2 AS N, v3 AS N, v4 AS N, v5 AS N, v6 AS N, v7 AS N )
	st1 = padl(alltrim(str(v1)),19,"0")
	st2 = padl(alltrim(str(v2)),19,"0")
	st3 = padl(alltrim(str(v3)),19,"0")
	st4 = padl(alltrim(str(v4)),19,"0")
	st5 = padl(alltrim(str(v5)),19,"0")
	st6 = padl(alltrim(str(v6)),19,"0")
	st7 = padl(alltrim(str(v7)),19,"0")
	master = *concat_lines(st1,st2,st3,st4,st5,st6,st7)
	sorted = sortsubstr(master,crlf())
	low5 =  0
	for i = 1 to 5
		low5 = low5 + val(word(sorted,i,crlf(),1))
	next i
	sum_five_lowest = low5
		
END FUNCTION
    Code:
    TestResult1 = 100
TestResult2 = 51
TestResult3 = 52
TestResult4 = 53
TestResult5 = 54
TestResult6 = 99
TestResult7 = 50

? sum_five_lowest(TestResult1,TestResult2,TestResult3,TestResult4,TestResult5,TestResult6,TestResult7)
= 260
    A little cleaner function....

    Code:
    FUNCTION sum_five_lowest AS N (v1 AS N, v2 AS N, v3 AS N, v4 AS N, v5 AS N, v6 AS N, v7 AS N )
	st1 = padl(alltrim(str(v1)),19,"0")
	st2 = padl(alltrim(str(v2)),19,"0")
	st3 = padl(alltrim(str(v3)),19,"0")
	st4 = padl(alltrim(str(v4)),19,"0")
	st5 = padl(alltrim(str(v5)),19,"0")
	st6 = padl(alltrim(str(v6)),19,"0")
	st7 = padl(alltrim(str(v7)),19,"0")
	master = *concat_lines(st1,st2,st3,st4,st5,st6,st7)
	sorted = sortsubstr(master,crlf())
	thefive = *WORD_REMOVE(sorted,6,crlf(),2)
	sum_five_lowest = *TOTAL(thefive)
END FUNCTION
    There can be only one.

    Comment

      #3
      Re: How to get lowest 5 values from a field list?

      Thanks Stan!!!!!

      That's awesome!

      Creative thinking to convert to the string an sort. I was all hung up on doing it as a numeric.

      Thanks again!

      Jeff

      Comment

        #4
        Re: How to get lowest 5 values from a field list?

        This should be equivalent.

        Code:
        FUNCTION sum_five_lowest AS N (v1 AS N, v2 AS N, v3 AS N, v4 AS N, v5 AS N, v6 AS N, v7 AS N )
	st = alltrim(str(v1)) + ","+v2+ ","+v3+ ","+v4+ ","+v5+ ","+v6+ ","+v7
	sorted = sortsubstr(st,",","A","N")
	thefive = *WORD_REMOVE(sorted,6,",",2)
	sum_five_lowest = *TOTAL(thefive)
END FUNCTION
        Which means you really don't need a function after all.

        Code:
        *TOTAL(*WORD_REMOVE(sortsubstr(alltrim(str(TestResult1)) + ","+TestResult2+ ","+TestResult3+ ","+TestResult4+ ","+TestResult5+ ","+TestResult6+ ","+TestResult7,",","A","N"),6,",",2))
        Last edited by Stan Mathews; 06-06-2008, 10:41 AM.
        There can be only one.

        Comment

          #5
          Re: How to get lowest 5 values from a field list?

          Thanks Stan.

          I tend to like the function though - "fits my eye better" you might say as far as reading the code.

          Regards,

          Jeff

          Comment

            #6
            Re: How to get lowest 5 values from a field list?

            Jeff,
            Here's an alternative solution, using an array:
            Code:
            FUNCTION sumFiveLowest AS N (vars as p, fname as c )
with vars
	dim numArray[7] as N
	for i=1 to 7
		numArray[i]=eval(fname+i)
	next
	numArray.sort("A")
	sum=0
	for i=1 to 5
		sum=sum+numArray[i]
	next
	sumFiveLowest=sum
end with
END FUNCTION
            You would call it this way:
            Code:
            TestResult1 = 100
TestResult2 = 51
TestResult3 = 52
TestResult4 = 53
TestResult5 = 54
TestResult6 = 99
TestResult7 = 50
ui_msg_box("sum lowest",sumFiveLowest(local_variables(),"TestResult"))

            Comment

              #7
              Re: How to get lowest 5 values from a field list?

              Thank you Peter.

              This is why I love Alpha so much. There is a huge amount of power "under the hood" and there is normally more than one way to do things. Plus, as has been said many times before.....this message board is AWESOME!

              Thanks again...

              Jeff

              Comment

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