9/4/2023 0 Comments Vector indexing matlab![]() ![]() Use coupon code FFT30 when checking out all three ebooks together and avail 30% discount. Richard K Johnson, “The Elements of MATLAB Style “, Cambridge University Press,ISBN-13: 978-0521732581↗ Categories Latest Articles, Matlab Codes, Tips & Tricks Tags Matlab Code, Tips & Tricks Matlab documentation on Matrix indexing↗ A Book detailing how MATLAB code can be written in order to maximize its effectiveness. Rate this article: ( 4 votes, average: 5.00 out of 5) Other Resources on Matlab’s Matrix Indexing: There are other functions similar to “isinf” like “isspace”,”isnan” etc., that look for the specific condition to satisfy and returns a logical array depending on the result. The “isinf” function returns a logical array which will specify whether an element is Inf (It also compares -Inf). This can be achieved by using “isinf” function in Matlab. Your rest of the script may need you to fix this by replacing the Inf with 0. Sometimes, when you run your script you might encounter ‘Inf’ (IEEE arithmetic representation for positive infinity) or -Inf( representation for negative infinity) values sitting in a matrix. Getting the row and column subscripts of those elements using the “find” function. Getting all elements of the matrix whose value is above 10 > x(x>10) Used to select the elements of a matrix that satisfy some criteria given by an expression > x=magic(4) %Create a magic array with 4x4 elements Accessing all elements on the third row > x(3,:)Įxtracting the last row using the “end” operator and the “:” operator > x(end,:) ![]() It is usually used to select all the elements in a specific column of row. The ‘:’ operator is the short form for 1:end. Selecting the elements in the first row – 4th,2nd and 1st column & third row – 4th,2nd and 1st column > x(,) The subscript indices can also be vectors. Accessing the element located at second row and third column > x(2,3) The two dimensional array elements are accessed with two subscript indices like x(i,j) – where ‘i’ represents row and ‘j’ represents column. Replacing the values of ‘x’ at position with 40 > x() = 40Ĥ0 11 6 8 14 3 18 -6 0 40 Two dimensional Arrays: > x=magic(4) %Create a magic array with 4x4 elements Replacing specific elements with a same value. Replacing the values of ‘x’ at positions with new values > x()= Replacing specific elements in the array by placing the new values on the right side of the expression. Selecting from fifth element to the end > x(5:end) Selecting all elements except the last element > x(1:end-1) You can do arithmetic on the ‘end’ operator. To refer the last element of the matrix x use ‘end’ operator > x(end) Making a new vector by swapping two halves of the vector x > x() Select a range of elements using ‘:’ operator.Įxample: Select elements with index ranging from 1 to 5. ![]() Let’s review indexing techniques in Matlab: Indexing one dimensional array, two dimensional array, logical indexing, reversiong a vector – are covered.Ĭonsider a sample vector in Matlab. ![]()
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