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March 30, 2020 Mir simple linear | ||||
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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); |
March 30, 2020 Re: Mir simple linear | ||||
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Posted in reply to Vino | 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);
}
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March 30, 2020 Re: Mir simple linear | ||||
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Posted in reply to jmh530 | 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... |
March 31, 2020 Re: Mir simple linear | ||||
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Posted in reply to Vino | 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.
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