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How do I count changes in row values?

I have a large data set where I have blocks of repeating values like this:

A

A

B

A

C

C

C

I would like to count the number of changes in row values or, in other words, a count of rows ignoring consecutive repeated rows.  In this example, the count would be 4 (The third 'A' is a change from 'B', so it counts).  Is there a way to have JMP count rows ignoring repeated and consecutive duplicates?

I'm using JMP 15.2.1.

 

Data TableRe: How do I count changes in row values?

It seems to be working!  Thanks!

 

Re: How do I count changes in row values?

One way would be to create formula using Lag and then you can get max value of that column

If(
 Row() == 1, 
  counter = 1;
 , Lag(:col, 1) != :col, 
  counter++
);
counter;

</CODE><SPAN class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="jthi_0-1647639220121.png" style="width: 400px;"><SPAN class="lia-inline-image-display-wrapper" image-alt="jthi_0-1647639220121.png" style="width: 207px;"><span class="lia-inline-image-display-wrapper" image-alt="jthi_0-1647639220121.png" style="width: 207px;"><img src="https://us.v-cdn.net/6038925/uploads/images/40960i3683E856360E0C73/jthi_0-1647639220121.png" role="button" title="jthi_0-1647639220121.png" alt="jthi_0-1647639220121.png" /></span></SPAN></SPAN></P> <P>&nbsp;</P> <P>&nbsp;</P> <P>Maybe something like this could also work:</P> <P>&nbsp;</P> <PRE><CODE class=" language-jsl">Col Cumulative Sum(Lag(:col) != :col)

 

 

 

Re: How do I count changes in row values?

Here are a couple of ways to handle this

Names Default To Here( 1 );
dt = Current Data Table();

For Each Row(
 If(
  Row() == 1, count = 1,
  :column 1 != Lag( :column 1 ), count
  ++)
);
Show( count );
// Look in the log for the value of count

// or

dt << New Column( "The Count",
 formula(
  If(
   Row() == 1, count = 1,
   :column 1 != Lag( :column 1 ), count
   ++);
   count;
 )
);