So I have to find angle theta between v and L, and then find vector w with negative theta?
I also have to find the plane of v and L by cross product of v and L ...
[PLAIN]http://img62.imageshack.us/img62/5319/49966749.png
What is the scalar multiples of a vector actually?
I was thinking L = c[2 1 2]T
Then I looked for projection of v on L. But I got c in my answers which are not supposed to be...
It said 24 is correct.
So we were dealing with R5.
This is R5x5. I guess the number elements on the main diagonal should be more than 20, but I only see 5 elements: a11, b22, c33, d44, e55 of 5x5 matrices A, B, C, D, E...
Ok, I think this one is a little bit trickier
If S is the subspace of R5x5 consisting of all matrices with trace 0, then what is dimension of S?
I found out that trace is sum of the diagonal.
And I also found out that symmetric matrices have zero trace.
The problem is I don't know how to find...
If S is subspace of R6x6 consisting of all lower triangular matrices, what is the dimension of S?
Does anyone know the properties about dimension of lower triangular matrices?
I have one more question about static variable.
If I have an array: Student [] students = new Student [20];
and I have to write a method to create a Student object and put a reference to this student in the students array.
For each time adding one student, I have to know how many students...
Oh, my! I couldn't think in that way.
If I don't have a default constructor methods, can I conbine like this?
public class Student{
private String name;
private int age;
private double gpa;
private char [] courseGrade;
private static int count = 0;
public Student(String name...
public class Student{
private static int count = 0;
public int getCount(Student s){
if (s == new Student())
count++;
}
}
I don't think it would be correct :rolleyes:
I feel I still miss something, do I need a loop to go through the class to get...