In MATLAB, the vector[1,2,3]is more easily created using the colon operator, i.e.1:3. You can use this in indexing as well. To select an entire row (or column), MATLAB provides a shortcut by allowing you just specify:. For example, the following code will also return the entire ...
Indexing is closely related to another term MATLAB users often hear:vectorization. Vectorization means using MATLAB matrix and vector operations instead of scalar operations—usually resulting in code that is shorter, more mathematically expressive and readable, and sometimes faster. Indexing Vectors Let’...
Using index vectors is a way of representing the data in order without physically sorting the data set. Finally, searching for values within a data set or a database is useful, so some basic searching techniques will be explained.Stormy Attaway...
The value ofw_prime(i,j)is calculated asmean( w( indY & indX ) ), whereindYandindXare the indices ofdYanddXthat are equal toiandjrespectively. Here's a simple implementation in matlab of an algorithm to computew_prime: for i = 1:size(w_prime,1) indY = dY == i; for j = 1...
In other words, we can index NumPy arrays 换句话说,我们可以索引NumPy数组 using either lists or other NumPy arrays. 使用列表或其他NumPy数组。 NumPy arrays can also be indexed using logical indices,but what does that actually mean? NumPy数组也可以使用逻辑索引进行索引,但这实际上意味着什么? Just ...
I would recommend you usenumelinstead oflength. Withnumelyour code will work whethertauandTare matrices or vectors. Withlengthit will break in interesting ways if any of them are matrices. サインインしてコメントする。 回答(2 件)
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A drawback to computing vectors in this way, when adding new searchable documents, is that terms that were not known during the SVD phase for the original index are ignored. These terms will have no impact on the global weights and learned correlations derived from the original collection of...
This connection is simply that for the inner product of two Boolean vectors to be 0, a 0 can be multiplied with a 0 or a 1, but a 1 cannot be multiplied with another 1. We will see in Section 2 that this behavior can be easily modeled using the or operator of a regular ...