EventVals=str2double(data_events(1:2:end,:)); EventCmnt=data_events(2,:);

str = '123';
num = str - '0';
% num = [1 2 3];

Hi Alex, you cannot mix double values with char values, but you still have to use a cell array (or drop the header 'Names'). % Suppose your input is: c = {'Name' '2/8' '3/7' '7/8'} EDIT (from Walter Roberson syntax, didn't know str2num behavior with operators) : % Then your output would look like this: [c(1); cellfun(@str2num,c(2:end),'un',0).'] ans = 'Name' [0.2500] [0.4286] [0.8750] Note that the ' are just there tell you that you're using a cell array of strings, but the actual content of each cell doesn't have them at all. For more info Oleg

An array of strings has to be a cell array. That said:

s = [12 25 34 466 55]
strtrim(cellstr(num2str(s'))')

Use str2double() or str2num() instead. You are doing the opposite.

Hi Nicle you need str2double() (or str2num()), not double(). double() gives you the UTF(?) code corresponding to the input string. Eg: double('a') % = 97 or double('1') % = 49 Conversely: char([97 49]) % = 'a1' But: str2double('1') % = 1 Also str2double() works on cellstrings, no need to for cell2mat(): str2double({'1' '2'}) % = 1 2 Best, Konrad

I'm guessing it's the space that is causing the problem. Run your array through x = regexprep(x,' ',''); first to remove the spaces.

Given that you have a cell array of string values, you can use cellfun to apply str2num conversion on each entry. The output will be a vector/matrix of the converted values.

d = {'2.3','3.5'}
dVec = cellfun(@str2num, d);

However, you are better using str2double than str2num. From the documentation:

Note: str2num uses the eval function to convert the input argument. Side effects can occur if the string contains calls to functions. Using str2double can avoid some of these side effects.

dVec = cellfun(@str2double, d);

Update: As @yuk points out, you can call str2double() directly on the cell array for the same output.

dVec = str2double(d);

Note that the same call with str2num() will give the "must be a string or string array" error.