[英]Initialize a vector in ejml with Matlab-like style
In Mablab/Octave, I can create a new vector with range-style, for example: 在Mablab / Octave中,我可以创建具有范围样式的新矢量,例如:
v = [1:10];
However, when I put it into ejml equation (Java), it doesn't work: 但是,当我将其放入ejml公式(Java)时,它不起作用:
eq.process("v = [1:10]");
It only works for explicit initialization like: 它仅适用于显式初始化,例如:
eq.process("v = [1 2 ]");
Can anyone do that, or suggest me a workaround for it? 任何人都可以这样做,或者为我建议解决方法? Thanks.
谢谢。
Actually this code 其实这段代码
eq.process("A = [1:5]");
DMatrixRMaj A = new DMatrixRMaj(eq.lookupMatrix("A"));
gives back 退还
Type = dense64 real , numRows = 1 , numCols = 5
1,000 2,000 3,000 4,000 5,000
To work with matrix and vectors you can use normal java operators and loops ans det it here is a example solving a linear system, and adding elements and then setting a Range vector column and row 要使用矩阵和向量,您可以使用常规的Java运算符并循环进行循环,这是解决线性系统,添加元素然后设置范围向量列和行的示例
I hope this helps you 我希望这可以帮助你
import org.ejml.factory.SingularMatrixException;
import org.ejml.simple.SimpleMatrix;
/**
* Created by anquegi on 15/05/15.
*/
public class TestEjml {
public static void main(String args[]){
//Solving a system
SimpleMatrix A = new SimpleMatrix(2,2);
SimpleMatrix b = new SimpleMatrix(2,1);
SimpleMatrix x;
// Can assign values the usual way
A.set(0,0,1);
A.set(0,1,4);
A.set(1,0,1);
A.set(1,1,1);
b.set(0,0,28);
b.set(1,0,10);
try {
x = A.solve(b);
System.out.println(x);
} catch ( SingularMatrixException e ) {
e.printStackTrace();
}
// So to do a Range
SimpleMatrix my_range_v = new SimpleMatrix(10,1);
for (int i = 0; i < my_range_v.numRows(); i++) {
my_range_v.set(i,i); // you can set also wit set(row,col,value)
}
// So to do a Range
SimpleMatrix my_range_h = new SimpleMatrix(1,10);
for (int i = 0; i < my_range_h.numCols(); i++) {
my_range_h.set(i,i); // you can set also wit set(row,col,value)
}
System.out.println(my_range_v);
System.out.println(my_range_h);
}
}
with the result: 结果:
Enter number: 2 输入数字:2
[info] Running ejml.TestEjml
Type = dense real , numRows = 2 , numCols = 1
4,000
6,000
Type = dense real , numRows = 10 , numCols = 1
0,000
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
Type = dense real , numRows = 1 , numCols = 10
0,000 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000
[success] Total time: 2 s, completed 15/05/2015 12:16:20
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