# Finding the number of duplicate points in the plane

#### francorbusetti

##### New Member
I have 2 columns representing points P in the x-y plane, e.g.

Pn xn yn
P1 2 3
P2 1 2
P3 9 6
P4 2 5
P5 1 2
P6 2 5

How can I find the number of duplicate points (e.g. 2 here)?
Needs to be via formula, not manually or code.

#### Eric W

##### MrExcel MVP
Possibly:

<b></b><table cellpadding="2.5px" rules="all" style=";background-color: rgb(255,255,255);border: 1px solid;border-collapse: collapse; border-color: rgb(187,187,187)"><colgroup><col width="25px" style="background-color: rgb(218,231,245)" /><col /><col /><col /><col /><col /></colgroup><thead><tr style=" background-color: rgb(218,231,245);text-align: center;color: rgb(22,17,32)"><th></th><th>A</th><th>B</th><th>C</th><th>D</th><th>E</th></tr></thead><tbody><tr ><td style="color: rgb(22,17,32);text-align: center;">1</td><td style="color: #333333;;">Pn</td><td style=";">xn</td><td style=";">yn</td><td style="text-align: right;;"></td><td style=";"># of Duplicates</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">2</td><td style="color: #333333;;">P1</td><td style="text-align: right;;">2</td><td style="text-align: right;;">3</td><td style="text-align: right;;"></td><td style="text-align: right;;">2</td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">3</td><td style="color: #333333;;">P2</td><td style="text-align: right;;">1</td><td style="text-align: right;;">2</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">4</td><td style="color: #333333;;">P3</td><td style="text-align: right;;">9</td><td style="text-align: right;;">6</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">5</td><td style="color: #333333;;">P4</td><td style="text-align: right;;">2</td><td style="text-align: right;;">5</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">6</td><td style="color: #333333;;">P5</td><td style="text-align: right;;">1</td><td style="text-align: right;;">2</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: rgb(22,17,32);text-align: center;">7</td><td style="color: #333333;;">P6</td><td style="text-align: right;;">2</td><td style="text-align: right;;">5</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr></tbody></table><p style="width:4.8em;font-weight:bold;margin:0;padding:0.2em 0.6em 0.2em 0.5em;border: 1px solid rgb(187,187,187);border-top:none;text-align: center;background-color: rgb(218,231,245);color: rgb(22,17,32)">Sheet8</p><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: rgb(255,255,255)" ><tr><td style="padding:6px" ><b>Worksheet Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: rgb(255,255,255);border-collapse: collapse; border-color: rgb(187,187,187)"><thead><tr style=" background-color: rgb(218,231,245);color: rgb(22,17,32)"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: rgb(218,231,245);color: rgb(22,17,32)">E2</th><td style="text-align:left">=SUMPRODUCT(<font color="Blue">IFERROR(<font color="Red">EXP(<font color="Green">LN(<font color="Purple">FREQUENCY(<font color="Teal">MATCH(<font color="#FF00FF">B2:B7&"|"&C2:C7,B2:B7&"|"&C2:C7,0</font>),ROW(<font color="#FF00FF">B2:B7</font>)-ROW(<font color="#FF00FF">B2</font>)+1</font>)-1</font>)</font>),0</font>)</font>)</td></tr></tbody></table></td></tr></table><br />

#### francorbusetti

##### New Member
Thanks, that's great

You're welcome.

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