0

answerThere is a Newton's method for finding zero of the function: x -> x-y/y' and the method of gradient descent for finding the minimum of function: x -> x - a*gradx.
Can they "cross" and get a more optimal version of gradient descent, e.g. the formula x -> x - a*y*gradx/(|gradx|^2)? If Yes, then how to do it properly?...

asked April 16th 20 at 11:16

4

answersPlease give some example of the use of symmetric matrices in the real world.
In addition to the multiplication tables.
Thank you)

asked April 7th 20 at 15:18

1

answerFriends, asking for a little help. Can you please recommend a good English textbooks on algebra and mathematical analysis, which would have covered the knowledge from the very basics, because I feel the lack of fundamental knowledge in this area.
At the moment, I found a few books with a good rating:
1. College Algebra, by...

asked April 7th 20 at 11:19

2

answersThere is interest in the field of machine learning and data science.
Decided to start with linear algebra, and python.
Actually questions:
1. How much time per day to devote to linear algebra and how to study independently? At the moment I spend on linear algebra 2—3h. in a day and the result do not watch. Have the book by ...

asked April 2nd 20 at 15:10

2

answersI think I can not understand . If we have a basis of 4-dimensional space have the right to say that if we have a 3-dimensional subspace we can Express any 3-dimensional vector using the basis of our 4-dimensional space ? (like if the 4-coordinate 0 , it's still a vector 3-dimensional space ?)

asked April 1st 20 at 15:41

1

answerHello!
For finding the argument of a complex number, I use the formula: cos ϕ = x / √ (x^2 + y^2), sin ϕ = y / √ (x^2 + y^2) for real and imaginary part of the number, and then get the values of ϕ.
Example:
z = -1
cos ϕ = 0, ϕ= π/2 + πn
sin ϕ = -1, -π/2 + 2πn
However, the textbook answer: arg(-1 )= π
The main argument is on...

asked March 31st 20 at 21:12

2

answersWelcome!
In General, the subject. Need to find a lot and often. Now use integrated ClippingLib but for 300 points considers the order of 4 seconds - a very long time.
Given: Polygons not semiprecious, convex and not convex.
In addition to the algorithm in the English Wikipedia found another description of this here:
Find t...

asked March 31st 20 at 20:38

3

answersThere is a range of values from 0.0 to 1.0, relatively basic scale of values (the subject is the engine speed).
Need values from this range to convert to values of the other scales, which is known 2 the values corresponding to the values underlying the scale 0.0, 0.2 and 1.0. Need a function which will calculate all interme...

asked March 31st 20 at 15:55

0

answer
Trying to prove
Consider the determinant in MatLab
a=[1 3 -1; 2 -1 5; -1 1 -3]
det(a)
Turns 0. So the only option is to X Y and Z were equal to 0 simultaneously, then the 3 vectors are not linearly dependent, and hence not coplanar.

asked March 30th 20 at 01:24

1

answerSuppose there is a matrix nx2, where n is always even. Can we consider determinants of matrices 2x2, and then put them - resulting in the determinant of the original matrix?

asked March 29th 20 at 21:33