Microsoft.VisualBasic IRR function in C#

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Can someone please help me

C#

double[] values = new double[73];
            for (int j = 1; j == values.Length - 1; j++)
            {
                values[j] = C158_Calc;
            }
            B162_Calc = Financial.IRR(ref values, 0.1);

I receive an error "Arguments are not valid."

Posted 1-Jun-10 2:00am

jellybeannn

Updated 1-Jun-10 2:01am

Johnny J.

v2

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Johnny J. · Answer 1 · 2010-06-01T02:03:00

Solution 1

When you start writing IRR, the intellisense should show you the available overloads for that method.

Do you have one there that accepts the types you supply (array of double by reference and double (presumably) ???

Posted 1-Jun-10 2:03am

Johnny J.

jellybeannn · Answer 2 · 2010-06-01T02:08:00

Solution 2

The function definition for IRR is (ref double[] ArrayValue, double guess)

All my values are double.

Posted 1-Jun-10 2:08am

jellybeannn

Comments

Johnny J. 1-Jun-10 8:17am

You should have posted this as a comment to my answer instead of clicking "Add answer", but never mind now. It looks ok to me, have you tested that your array is not null/empty?

jellybeannn 1-Jun-10 8:27am

Ok the aray is returning 0,

How can I then add the value to the array, I'm creating a DataSet with 270 months so I have a for loop for this, and I calculated C158_Calc for each month(these values are correct), I can I put each month's C158_Calc in the array. BTW this is the 6year IIR so only up to Month 73.

double[] values = new double[73];

DataTable dt = new DataTable("Details");
DataSet ds = new DataSet();
ds.Tables.Add(dt);

for (int i = 1; i <= 240; i++)
{
dt.Columns.Add("Month" + i, typeof(string));
}

dt.Columns.Add("End", typeof(string));

double C152_Calc = C150_Calc + C151_Calc;

double BW154_Calc = 0.0;
if (i == 72)
BW154_Calc = (C152_Calc * 12 / G169_In) * 100;
if (i == 240)
BW154_Calc = (C152_Calc * 12 / G170_In) * 100;

num3 += BW154_Calc;

// calculate 6 year IRR
if (i == 1)
C158_Calc = H30_Out + C152_Calc;
if (i >= 2 && i <= 72)
C158_Calc = C152_Calc;
if (i == 73)
C158_Calc = C152_Calc + num3;

// total 6 year IRR
for (int j = 1; j == values.Length - 1; j++)
{
values[j] = C158_Calc;
}

// calculate 20 year IRR
double C160_Calc = 0.0;
if (i == 1)
C160_Calc = H30_Out + C152_Calc;
else
C160_Calc = C152_Calc;

row1["Month" + i] = String.Format("{0:#,###,###,###}", C146_Calc);
row2["Month" + i] = String.Format("{0:#,###,###,###}", C148_Calc);
row3["Month" + i] = String.Format("{0:#,###,###,###}", C150_Calc);
row4["Month" + i] = String.Format("{0:#,###,###,###}", C151_Calc);
row5["Month" + i] = String.Format("{0:#,###,###,###}", C152_Calc);
row6["Month" + i] = String.Format("{0:#,###,###,###}", BW154_Calc);
row7["Month" + i] = String.Format("{0:#,###,###,###}", C158_Calc);
row8["Month" + i] = String.Format("{0:#,###,###,###}", C160_Calc);
}

B162_Calc = Financial.IRR(ref values, 0.1);
row9["Month1"] = String.Format("{0:#,###,###,###.##}", B162_Calc);

CPallini · Answer 3 · 2010-06-01T02:22:00

Solution 3

I suppose the answer to your question is in the IRR method documentation [^]:

ValueArray
Type: System.Double[]
Required. Array of Double specifying cash flow values. The array must contain at least one negative value (a payment) and one positive value (a receipt).

:)

Posted 1-Jun-10 2:22am

CPallini

Updated 1-Jun-10 2:24am

v2