First create a function to create a matrix, given column vectors of ids, ans, and steps for a single subject (I'm using more meaningful variable names. hey, I want to create a matrix/array A with size(n,2) (for arbitrary n) such that A(:,1) = zeros(n,1) A(,2) = 0 A(n,2) = x (with x a symbolic, in matlab written as 'sym x' ). Simply assign the lower right element to zero, even if that element does not exist yet, and it will pad everything.
#ADD ELEMENT TO CELL ARRAY MATLAB CODE#
r = find (any (~A,2)) Or:b = d = padarray (b, ,0) This code is padding a row above and a row below the matrix but i just want it below the 2x3 matrix.
If you want to find which rows contain zeros rather than where each zero is located, you could do one of the following: Theme. Therefore, you're going to get multiples like that. = find (A = 0) returns in r and c the row and column indices of every single zero in the array. A sparse array (instead of a full, zeros array) is probably a better idea in this scenario, due to the low sparsity (0.3% as mentioned by Adriaan), which could increase performance in any subsequent computations.2. bad = isnan(x) x(bad) = 0 This is pretty basic stuff. First make an array of true/false values, then use this to set selected elements to zero. If x is your matrix then use the isnan function to index the array: x( isnan(x) ) = 0 If you do it in two steps it's probably clearer to see what's happening.Es habitual combinar las dos líneas anteriores de código en una única línea: X = zeros (size (A)) Cree un arreglo de ceros que tenga el mismo tamaño que un arreglo existente. Clonar el tamaño de un arreglo existente. Calling nonzeros on the matrix a will return a vector of elements.However, if it is your desire to replace all values in the matrix with either 0 or 1, where 1 is anything non-zero, you can simply create a logical matrix like so: A = A ~= 0 If it is your desire to also have this be a double matrix, you can easily do that by the uplus (unary plus) operator or cast to double 1: A = + (A ~= 0) %// or %A. Learn more about row, column, matrix, array, add, remove MATLABTo remove a single zero from each row of a matrix and rebuild the new matrix of nonzero entries, try the following code: garcia venegas If you give it a try in MATLAB you'll see that getting the appropriate sized output takes a bit of thinking.
#ADD ELEMENT TO CELL ARRAY MATLAB HOW TO#
How to add a first row and a first column of.
A (badRows, :) = Of course you could compress all that into a single line if you want but I just used separate lines for tutorial purposes so you can see what's going on.
You just show an simple matrix, which has the same zeros in each row.
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