Size of the vector data

How can I define that the data in a vector is all long float?

Tks ;)

Answer 1

[Star Strider]

It will automatically be double-precision floating-point (double) unless you specify a different data type (such as single, int8, or other options). It also maintains full internal precision regardless of the format option you use to display it.

[Samuel Siqueira]

Yes I understand. You can not do this? Can you give me an example?

[Star Strider]

All numeric data is by default IEEE 754 double-precision (8-byte) floating-point (that I assume is what you intend by ‘long float’) unless to specify otherwise.

As for an example:

format long
x = pi
whos('x')

produces:

x =
   3.141592653589793

  Name      Size            Bytes  Class     Attributes
  x         1x1                 8  double  

and similarly:

format short
x
whos('x')

produces:

x =
    3.1416

  Name      Size            Bytes  Class     Attributes
  x         1x1                 8  double 

The format call simply affects how the numbers are written to the Command Window. It has no effect on the internal precision, that is the same regardless of your format option.

[Stephen23]

Samuel Siqueira's "Answer" moved here:

Now I understand! Many thanks, really!