How to reduce the precision of calculations in Matlab?

49 次查看（过去 30 天）
Vitaliy Chistyakov
Vitaliy Chistyakov 2016-9-16
回答： Krishna Bindumadhavan 2019-9-14
Hello everyone! I'm writing an algorithm, which is then required to perform in the microcontroller. Usually ADC has 14-bit. Matlab uses a data type of double (64-bit, double -precision) and float (32-bit, single-precision) when using real numbers: -12,234 or 742,0263 etc. How to reduce the precision of calculations in Matlab (maybe use half-precision, but i don't know how), or reduce the bit my variables (e.g. 16-bit) to work with the ADC?
  4 个评论
显示 2更早的评论
Guillaume
Guillaume 2016-9-16
编辑：Guillaume 2016-9-16
@Stephen, the float type in C languages normally means a 32-bit floating point number and matlab keeps this convention, as 'float' is an accepted precision for fread (and is equivalent to 'single').

请先登录，再进行评论。

请先登录，再回答此问题。

回答（3 个）

Guillaume
Guillaume 2016-9-16
If you are really limited to 14 bits for real numbers, then probably you should be used fixed-point numbers instead of floating point numbers. As far as I know matlab does not support half-precission IEEE-754 numbers and anyway these are 16 bits.
  1 个评论
Walter Roberson
Walter Roberson 2016-9-16
https://www.mathworks.com/matlabcentral/fileexchange/23173-ieee-754r-half-precision-floating-point-converter
Also there might be some GPU support for half precision.

请先登录，再进行评论。

Walter Roberson
Walter Roberson 2016-9-16
When you read a sample from an ADC that uses has 14 bit integer resolution, the result is a 16 bit number that has the value in the most significant 14 bits.
Krishna Bindumadhavan
MATLAB now supports half precision floating point numbers via the half precision object, which is available from the fixed point designer toolbox. For more information, please refer to:
https://www.mathworks.com/help/fixedpoint/ref/half.html

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by