What is the difference between a. * B and a * B in MATLAB? A and B are matrices

What is the difference between a. * B and a * B in MATLAB? A and B are matrices

Buy a book and have a look. Those with points are called "point multiplication" and "position multiplication", that is, two matrices with the same number of rows and columns are multiplied one by one at the corresponding positions, and the result corresponds to the result matrix (conditional size (a) = size (b)) a = [1234; 5678] a = 12345678 > > b = [2468; 10121

Matlab how to compare each value in the matrix
For example, if there is a matrix A (0,1,2,0,4,5) B (- 1,2,0,1,3,6), how to let the number greater than a in B replace the value in a, and the number less than a keep the value in a unchanged, so that the result matrix is C (0,2,2,1,4,6)

A = [0 1 2 0 4 5];B=  [-1 2 0 1 3 6];t = B>A;A(t) = B(t)

Matlab calculates the area of two curves y = f 1 (x), y = f 2 (x) on [x 1, x 2]

Two functions are subtracted and then integrated
int('abs(f(2)-f(1))','t',x1,x2)
This is the way of thinking. Think about it carefully

Are the following words followed by countable nouns or uncountable nouns?
the number of a number of a small number of a large number of

The first one is countable, and the last three are countable or uncountable

How does the original formula of a ^ 4-4a + 3 = a ^ 4-a-3a + 3 = (A-1) (a ^ 3 + A ^ 2 + A-3) come from?

Original formula = a ^ 4-a-3a + 3 = a (a ^ 3-1) - 3 (A-1) = a (A-1) (a ^ 2 + A + 1) - 3 (A-1) = (A-1) (a ^ 3 + A ^ 2 + a) - 3 (A-1) = (A-1) (a ^ 3 + A ^ 2 + A-3)
Where, a ^ 3-1 = (A-1) (a ^ 2 + A + 1)

English phrasal elements
Is it keeper to travel by sea

In the sentence, it is the formal subject. The real subject is to travel by sea

In the triangle ABC, BD and CE are the heights on the sides of AC and ab respectively, and G and F are the midpoint of BC and de respectively

Proof: connecting Ge and Gd, then
Because CE ⊥ be, CD ⊥ BD, G is the midpoint of BC
So Ge = GD = BC / 2
Because f is the midpoint of De, Ge = GD
So FG ⊥ de (the middle line of an isosceles triangle is perpendicular to the bottom)

How does dish become plural?

dishes

In △ ABC, Sina = cosbcosc is known, and tanb + Tanc = 1 is proved
rt
Sina = cosbcosc why = sin (B + C) = cosbcosc
It's supposed to be Sina = sin (180-b-c)?

Because in the triangle ABC, there is
sinA=cosBcosC
sin(B+C)=cosBcosC
sinBcosC+cosBsinC=cosBcosC
Divide both sides of the equation by cosbcosc to get
sinB/cosB+sinC/cosC=1
That is, tanb + Tanc = 1

He like meat very much.He likes meat___ _______ (conversion of synonymous sentence patterns)

He like meat a lot.