如何根据行和列号创建数组 [英] How to create an array according to row and column number

问题描述

我想根据行号和列号创建一个数组.

I want to create an array according to row number and column number.

例如:

row_number   Column_number    Value
  1               1            5
  3               2           10
  4               6            4
  7               5           66

该数组应类似于:

A=


 5   0   0   0   0   0
 0   0   0   0   0   0
 0  10   0   0   0   0
 0   0   0   0   0   4
 0   0   0   0   0   0
 0   0   0   0   0   0
 0   0   0   0  66   0

否则它将打印零.

推荐答案

此常见问题的3种可能方法:

3 possible methods to this regularly asked question:

1.使用 sub2ind 函数

A = zeros(max(row_number), max(Column_number));
idx = sub2ind(size(A),row_number, Column_number);
A(idx) = Value;

2.手动计算线性索引

2. Calculating the linear indices manually

A = zeros(max(row_number), max(Column_number));
idx = row_number(:,1) + (Column_number(:,2)-1)*size(A,1)
A(idx) = Value;

3.使用 sparse 矩阵

sparse(row_number, Column_number, Value)

然后调用 full 如果要将其转换为常规矩阵

And then call full on that if you want to convert it to a regular matrix

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