Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

?lapy2

Returns
sqrt(
x
2
+
y
2
)
.

Syntax

float
LAPACKE_slapy2
(
float
x
,
float
y
);
double
LAPACKE_dlapy2
(
double
x
,
double
y
);
Include Files
  • mkl.h
Description
The function
?lapy2
 returns
sqrt
(x
2
+y
2
), avoiding unnecessary overflow or harmful underflow.
Input Parameters
A
<datatype>
 placeholder, if present, is used for the C interface data types in the C interface section above. See C Interface Conventions for the C interface principal conventions and type definitions.
x
,
y
Specify the input values
x
 and
y
.
Return Values
The function returns a value
val
.
If
val
=-1D0
, the first argument was NaN.
If
val
=-2D0
, the second argument was NaN.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.