How To Use VBA Complex Calculations In Excel

Oct 24, 2020 • edited Oct 25, 2020

How To Use VBA Complex Calculations In Excel

The kth term, Tk, of a certain mathematical series is defined by the following formula:

Tk=k2 + 6k + 1
9k + 7

The first term, T1, of the series is obtained by substituting k = 1 into the formula i.e.

T1=12 + 6 + 1=1and
9 + 72
T2=22 + 12 + 1=17... and so on
18 + 725

Below we will look at a program in Excel VBA that calculates any term Tk and summation of terms up to N.

Complex Calculations in Excel VBA

Explanation: the user has the option to enter “All” or “Odd”, to respectively calculate the sum of the first N terms of the series or the sum of only the odd terms up to N.

Place a command button on your worksheet and add the following code lines:

1. First, we declare four variables of type Integer and one variable of type String.

Dim i, term, N, stepSize As Integer

Dim sumType As String

2. Second, we initialize the variables.

i = 0

N = Range(“C2”).Value

sumType = Range(“C3”).Value

3. Empty the fields.

Range(“A8:B1000”).Value = "”

Range(“C6”).Value = "”

4. Determine stepSize.

Select Case sumType

Case Is = “All”

stepSize = 1

Case Is = “Odd”

stepSize = 2

Case Else

MsgBox “Enter a valid expression in cell C3”


End Select

Tip: go through our Select Case program to learn more about the Select Case structure.

5. Do the calculations.

For term = 1 To N Step stepSize

Cells(8 + i, 1).Value = term

Cells(8 + i, 2).Value = (term ^ 2 + (6 * term) + 1) / ((9 * term) + 7)

Range(“C6”).Value = Range(“C6”).Value + Cells(8 + i, 2).Value

i = i + 1

Next term

Explanation: we use the Step keyword to specify the increment (1 for “All” and 2 for “Odd”) for the counter variable of the loop.


Complex Calculations Result

#Tutorial#How To#VBA#Loop

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