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DigitCount

Usage

DigitCount[n, b, d]用来给出nb进制表示中数字d的个数.
DigitCount[n, b]用来给出nb进制表示中数字1,2,...,b-1, 0的个数.
DigitCount[n]用来给出n10进制表示中数字1,2,...,9, 0的个数.


Notes

DigitCount[n]等价于 DigitCount[n, 10, Mod[Range[10],10]].
• 整型数学函数(参见 A.3.10节).
• 参见Mathematica全书: 3.2.4节.
Further Examples

Here is a small number.

In[1]:=  

Here are two ways to see its digits in base  .

In[2]:=  

Out[2]//BaseForm=

In[3]:=  

Out[3]=

This counts how many times  occurs in the base  expansion of x.

In[4]:=  

Out[4]=

In the list of digits there are  ones,  two,  threes,  fours,  fives,  sixes and  zeros.

In[5]:=  

Out[5]=