MATLAB: Getting an array with data

array matrix

Hello,

I have a question regarding getting data from an array

I have one array of data. lets say (array 1):

Index Speed # 1 5 # 2 9 # 3 4 # 4 5

(index 1 has value 5 , index 2 has value 9 etc)

I made another array (array= indexdata) which contain the indexnumbers of the values which are interested for me ( lets say i only want to look at index number two which has the value 2).

So how can i program that matlab makes a new array of the values of the first arrays, whose indeces are listed in the second array,

it sounds complicated but what i want is easy 🙂

Best Answer

So ,

array1 = [ 5 9 4 5]      % original array
array2 = [ 2 4 ]         % array of indices
array3 = array1(array2)  % elements from array1 as per indices listed in array 2

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myArray = [1 2 3; 4 5 6; 7 8 9; 10 11 12; 13 14 15];
result = myArray( [1 3 4], : );

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data = 1:1000;
array1 = 1:10:101
array1 = 1×11
     1    11    21    31    41    51    61    71    81    91   101
idx = array1(:)+(0:2);
out = data(idx)
out = 11×3
     1     2     3
    11    12    13
    21    22    23
    31    32    33
    41    42    43
    51    52    53
    61    62    63
    71    72    73
    81    82    83
    91    92    93

Best Answer

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MATLAB: I have a matrix of 5 rows and 3 columns and i want to select only 1st 3rd and 4th row with all column using an array how to do it?whats the script

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