Indexing into a matrix is a means of selecting or modifying a subset of elements from the matrix. MATLAB®has several indexing styles that are not only powerful and flexible, but also readable and expressive.
Let's say I have a matrix A (Nx2) which holds pixel indices of pixels in matrix B. I would like to use matrix A and replace the pixels in matrix B with some value (e.g.255) the easy way would be to use a For loop: B(A(i, 1), A(i, 2)) = 255; Is it possible to ...
Matrix Indexing in MATLABEddins, SteveShure, Loren
If there is a simple way to build this, it will be a great help. Thank you. 回答(0 件) サインインしてこの質問に回答する。 参考 MATLAB Answers How to calculate variance? 1 回答 Bootstapping a Data Matrix 1 回答 multiply col vector with matrix ...
MATLAB Online에서 열기 Ran in: For matrix R, sort(R) sorts each column and indsort are row indices. To reproduce the sorted matrix, you can convert those row indices into linear indices. Here are a few ways to do that: 테마복사 R = rand(10,10) R = 10x10 0.3822 ...
I'm trying to index a large matrix, with the goal of finding/indexing the first value to meet a threshold. Right now I'm doing it in a loop, but it's rather slow. For example: a=[10 13 14 15 16;... 11 12 15 16 17;... 3 5 8 9 12]; threshold=11.5; I want it to ...
(MATLAB) 我有一个N×N矩阵,A和一个行索引向量v.我想替换的对角线元素一个只为行中的一个被指定的v不使用for循环. 例如: N = 10; A = rand(N,N); %Random N x N matrix v = [1 4 6 9 10]; %vector of row indices %What I want to do but without a for loop: for i = 1:...
A row matrix B=[21 43 23 65]. Now I want to sort them in ascending order and also want the order of their location. How to do this??? I want the output file look like: [21 23 43 65] and [1 3 2 4]. 0 Comments Sign in to comment. ...
Help with matrix indexing.You seem to be treating this in a sorta symbolic way trying to tell MATLAB that the c(i-1) element is really element c(16,0) when i==1. However, what you have done in practice is an if
在MATLAB中,索引通常用于访问数组或矩阵的元素。错误的索引使用可能包括越界索引、使用非整数索引等。例如,如果你尝试访问一个矩阵的第5行第0列的元素(matrix(5,0)),这将会导致索引错误,因为列索引从1开始。 确保你的索引值在有效范围内,并且适用于你正在操作的数据类型。 确保在定义符号函数时遵循正确的语法: ...