www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.announce - Mir simple linear

reply Vino <akashvino79 gmail.com> writes:
Hi All,

   Can anyone  guide me what is the problem  with below code as it 
throws  error.

import std.stdio, mir.math.common: approxEqual;
static immutable x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
static immutable y = [1, 3, 2, 5, 7, 8, 8, 9, 10, 12];
auto params = x.simpleLinearRegression(y);
writeln(params);
Mar 30
next sibling parent reply jmh530 <john.michael.hall gmail.com> writes:
On Monday, 30 March 2020 at 17:21:57 UTC, Vino wrote:
 Hi All,

   Can anyone  guide me what is the problem  with below code as 
 it throws  error.

 import std.stdio, mir.math.common: approxEqual;
 static immutable x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
 static immutable y = [1, 3, 2, 5, 7, 8, 8, 9, 10, 12];
 auto params = x.simpleLinearRegression(y);
 writeln(params);
This should be in the Learn forum. As far as I can tell, the problem is that x and y are both type immutable(int[]), which it cannot handle. I tried just turning them into slices, but that wasn't sufficient, I had to ensure they were double as well (float would also work). Note that the example in the document uses a y variable that is a floating point type. /+dub.sdl: dependency "mir-algorithm" version="~>3.7.25" +/ import std.stdio : writeln; import mir.math.stat : simpleLinearRegression; import mir.ndslice : sliced; void main() { auto x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9].sliced!double; auto y = [1, 3, 2, 5, 7, 8, 8, 9, 10, 12].sliced!double; auto params = x.simpleLinearRegression(y); writeln(params); }
Mar 30
parent jmh530 <john.michael.hall gmail.com> writes:
On Monday, 30 March 2020 at 17:47:19 UTC, jmh530 wrote:
 
 [snip]
The relevant function signature is safe sumType!YRange[2] simpleLinearRegression(XRange, YRange)(XRange x, YRange y) if (isInputRange!XRange && isInputRange!YRange && !(isArray!XRange && isArray!YRange) && isFloatingPoint!(sumType!YRange)); and when you pass an int[] for y, then it determines that int is not a floating point and you get an error about not matching the signature, nothing about why you're not matching it. A good example of where Atila's concepts library would be helpful...
Mar 30
prev sibling parent 9il <ilyayaroshenko gmail.com> writes:
On Monday, 30 March 2020 at 17:21:57 UTC, Vino wrote:
 Hi All,

   Can anyone  guide me what is the problem  with below code as 
 it throws  error.

 import std.stdio, mir.math.common: approxEqual;
 static immutable x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
 static immutable y = [1, 3, 2, 5, 7, 8, 8, 9, 10, 12];
 auto params = x.simpleLinearRegression(y);
 writeln(params);
static immutable y = [1.0, 3, 2, 5, 7, 8, 8, 9, 10, 12]; `.0` will change the sum type of y to double.
Mar 30