为矩阵的每一行设置特定列的值
[英]Set a value of a specific column for each row of a matrix
问题描述
I have a matrix A with m rows and I'd like to set a specific element of each row equal 1. The column index varies from row to row and is specified by a column vector a (with m values). 
我有一个m行的矩阵A ，我想将每行的特定元素设置为1.列索引因行而异，并由列向量a （ m值）指定。 That is, I want A_{i,a_i} = 1 . 也就是说，我想要A_{i,a_i} = 1 。 Is there a quick way to do this in Matlab (without a for-loop)? 在Matlab中有没有快速的方法（没有for循环）？
1 个解决方案
解决方案1
2 已采纳 2014-01-06 19:12:45
我使用sub2ind函数解决了它：
A(sub2ind(size(A), 1:numel(a), a')) = 1
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