Create a zero-filled 2D array with ones at positions indexed by a vector

by

Two approaches you can use here.

Approach 1:

y = [1; 3; 2; 1; 3];
yvec = zeros(numel(y),3);
yvec(sub2ind(size(yvec),1:numel(y),y'))=1

Approach 2 (One-liner):

yvec = bsxfun(@eq, 1:3,y)

More Related Contents:

  1. Is vectorised data manipulation sequential (e.g R and MATLAB)?
  2. Which part of this is a non-negative integer? (factorial error) [closed]
  3. Finding islands of zeros in a sequence
  4. “Undefined function ‘function_name’ for input arguments of type ‘double’.”
  5. For loop to split matrix to equal sized sub-matrices
  6. Octave / Matlab: Extend a vector making it repeat itself?
  7. How can I plot a function with two variables in Octave or Matlab?
  8. Getting FFT peaks from data
  9. How can I apply a function to every row/column of a matrix in MATLAB?
  10. How to assign values to a MATLAB matrix on the diagonal?
  11. Why is reshape so fast? (Spoiler: Copy-on-Write)
  12. Multiply a 3D matrix with a 2D matrix
  13. pdist2 equivalent in MATLAB version 7
  14. Vectorizing the Notion of Colon (:) – values between two vectors in MATLAB
  15. Sweep / chirp signal ends at incorrect frequency
  16. How do I compare all elements of two arrays?
  17. Fast Algorithms for Finding Pairwise Euclidean Distance (Distance Matrix)
  18. How can I sort a 2-D array in MATLAB with respect to one column?
  19. How do I detect if I’m running MATLAB or Octave?
  20. Octave/Matlab: Adding new elements to a vector
  21. BSXFUN on memory efficiency with relational operations
  22. MATLAB: Subtracting matrix subsets by specific rows
  23. Efficiently compute a 3D matrix of outer products – MATLAB
  24. How to generate all pairs from two vectors in MATLAB using vectorised code?
  25. How can I accumulate cells of different lengths into a matrix in MATLAB?
  26. How should I update the data of a plot in Matlab?
  27. [caffe]: check fails: Check failed: hdf_blobs_[i]->shape(0) == num (200 vs. 6000)
  28. Return Unique Element with a Tolerance
  29. support vector machines in matlab
  30. How to plot a circle in Matlab?

Leave a Comment