Hash tables in MATLAB

by

Consider using MATLAB’s map class: containers.Map. Here is a brief overview:

  • Creation:

    >> keys = {'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', ...
  'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec', 'Annual'};

>> values = {327.2, 368.2, 197.6, 178.4, 100.0,  69.9, ...
  32.3,  37.3,  19.0,  37.0,  73.2, 110.9, 1551.0};

>> rainfallMap = containers.Map(keys, values)

rainfallMap = 
  containers.Map handle
  Package: containers

  Properties:
        Count: 13
      KeyType: 'char'
    ValueType: 'double'
  Methods, Events, Superclasses

  • Lookup:

    x = rainfallMap('Jan');

  • Assign:

    rainfallMap('Jan') = 0;

  • Add:

    rainfallMap('Total') = 999;

  • Remove:

    rainfallMap.remove('Total')

  • Inspect:

    values = rainfallMap.values;
keys = rainfallMap.keys;
sz = rainfallMap.size;

  • Check key:

    if rainfallMap.isKey('Today')
    ...
end

More Related Contents:

  1. Is there any standard rule for considering the best result or at which stage I have to stop train the data with minimum error
  2. How can I index a MATLAB array returned by a function without first assigning it to a local variable?
  3. Is MATLAB OOP slow or am I doing something wrong?
  4. How to elegantly ignore some return values of a MATLAB function
  5. How do you concatenate the rows of a matrix into a vector?
  6. How to execute multiple statements in a MATLAB anonymous function?
  7. How to make the blackboard text appear clearer using MATLAB?
  8. Is MATLAB row specific or column major?
  9. Get the indices of the n largest elements in a matrix
  10. Generate a random number in a certain range in MATLAB
  11. Suppress exponential formatting in figure ticks
  12. Declaring a global variable in MATLAB
  13. How does this code for standardizing data work?
  14. Passing functions as arguments in Matlab
  15. Matlab: implementing what CTRL+C does, but in the code
  16. How can I divide each row of a matrix by a fixed row?
  17. PCA in matlab selecting top n components
  18. How to subtract a vector from each row of a matrix? [duplicate]
  19. How can I load 100 files with similar names and/or string in just one step in MATLAB?
  20. Octave/Matlab: Adding new elements to a vector
  21. How to use SIFT algorithm to compute how similar two images are?
  22. using precomputed kernels with libsvm
  23. Remove noise from wav file, MATLAB
  24. Convert output from symbolic math (sym) to float
  25. How to change the window title of a MATLAB plotting figure?
  26. How do I create enumerated types in MATLAB?
  27. How to find out if a matrix is singular? [duplicate]
  28. Matlab: How to get the current mouse position on a click by using callbacks
  29. How to initialize an array of structs in MATLAB?
  30. Display matrix with row and column labels

Leave a Comment