Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: tossing a coin
Replies: 3   Last Post: May 30, 2013 6:08 AM

 Messages: [ Previous | Next ]
 fd Posts: 43 Registered: 7/24/09
Re: tossing a coin
Posted: May 30, 2013 6:08 AM

Hi,

A variation of Dana's answer, if you'd like to keep the tossing results as a list

In[2]:= k = RandomChoice[{"h", "t"}, 30]

Out[2]= {"t", "h", "h", "h", "t", "t", "h", "t", "h", "h", "h", "t", \
"t", "t", "t", "h", "t", "h", "h", "t", "t", "t", "h", "h", "t", "h", \
"t", "t", "t", "h"}

In[8]:= k //. {x___, "t", "h", "h", y___} :> {x, "PATTERN A", y}

Out[8]= {"PATTERN A", "h", "t", "t", "h", "PATTERN A", "h", "t", "t", \
"t", "t", "h", "PATTERN A", "t", "t", "PATTERN A", "t", "h", "t", \
"t", "t", "h"}

A more literal way is to create the sequences by partitioning with padding

In[29]:= Position[Partition[k, 3, 1], {"t", "h", "h"}]

Out[29]= {{1}, {8}, {17}, {22}}

Best Regards

Date Subject Author
5/28/13 michael partensky
5/30/13 fd
5/29/13 Dana