TimesBy

✖
`TimesBy`

✖

x*=c

multiplies x by c and returns the new value of x.

Details

x*=c is equivalent to x=x*c.
TimesBy has the attribute HoldFirst.
In TimesBy[x,c], x can be a symbol or other expression with an existing value. »

Examples

open allclose all

Basic Examples (1)Summary of the most common use cases

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-bap7e6

Out[1]=1

In[2]:=2

✖

https://wolfram.com/xid/0e7n21d5-puo9n2

Out[2]=2

Scope (4)Survey of the scope of standard use cases

Multiply by a numerical value:

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-3mn70w

Out[1]=1

Multiply by a symbolic value:

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-2dqqdg

Out[1]=1

Multiply all values in a list by a scalar:

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-boaay

Out[1]=1

In[2]:=2

✖

https://wolfram.com/xid/0e7n21d5-2v76mu

Out[2]=2

Multiply all values in a list by another list:

In[3]:=3

✖

https://wolfram.com/xid/0e7n21d5-koraoz

Out[3]=3

The first argument to TimesBy need not be a symbol:

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-5axyxt

Out[1]=1

In[2]:=2

✖

https://wolfram.com/xid/0e7n21d5-s6reew

Out[2]=2

In[3]:=3

✖

https://wolfram.com/xid/0e7n21d5-tck70d

Out[3]=3

Applications (1)Sample problems that can be solved with this function

Find the first power of two above one million:

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-7nduh

Out[1]=1

Properties & Relations (2)Properties of the function, and connections to other functions

TimesBy is a short form of this assignment:

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-ikmu0

Out[1]=1

DivideBy is closely related:

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-bf7yqs

Out[1]=1

In[2]:=2

✖

https://wolfram.com/xid/0e7n21d5-hcng87

Out[2]=2

Possible Issues (1)Common pitfalls and unexpected behavior

A variable to be multiplied must have an initial value:

In[1]:=1

✖

https://wolfram.com/xid/0e7n21d5-xd9vjs

Out[1]=1

Top