Replacing an array with string using condition

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Sowmya MR
Sowmya MR 2016-10-20
编辑： Walter Roberson 2016-10-21
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?

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回答（1 个）

Walter Roberson
Walter Roberson 2016-10-20
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'};
  2 个评论
Sowmya MR
Sowmya MR 2016-10-20
Thank you. I tried this but get an error "Conversion to cell from char is not possible. "
Walter Roberson
Walter Roberson 2016-10-21
编辑：Walter Roberson 2016-10-21
>> 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]

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