Replacing an array with string using condition

Hi,

I have an array X=[0 0.1 0.2 0.3..... 30]. Now i should replace all values between a range with a string. For example: X(X>=0 &X<4)='delta', X(X>=4 &X<8)='theta', X(X>=8 &X<12)='alpha', X(X>=12 &X<30)='beta'. Can someone please help me with this?

Answer 1

[Walter Roberson]

That cannot be done in MATLAB. In MATLAB, numeric arrays cannot hold strings.

You could convert the numeric array to a cell array and store strings in that.

X_cell = num2cell(X);

I suggest you learn how to use logical indexing:

mask = X>=4 & X<8;
X_cell(mask) = {'something'};

[Sowmya MR]

Thank you. I tried this but get an error "Conversion to cell from char is not possible. "

[Walter Roberson]

>> X = (rand(3,5)*10);
>> X_cell = num2cell(X);
>> mask = X>=4 & X<8;
>> X_cell(mask) = {'something'};
>> X_cell
X_cell =
  3×5 cell array
    'something'            [0.461713906311539]    'something'           [0.344460805029088]    'something'       
    [0.318328463774207]    [0.971317812358475]    [3.17099480060861]    'something'            'something'       
    [  2.7692298496089]    [ 8.23457828327293]    [9.50222048838355]    [ 3.81558457093008]    [1.86872604554379]