如何在Matlab中将单元格数组转换为数值数组？

Question

I have read some data from an Excel file in Matlab. A cell array has been generated as follow:

x={'11', 'NaN', 'NaN', '13', 24}

I want to convert cell array to a numeric matrix (for other required calculations) and convert 'NaN' elements to zero in my numeric matrix. How can I do it?

Thank you.

Answer 1

You can use str2double to convert strings to numeric values:

x={'11', 'NaN', 'NaN', '13', '24'};
nx = str2double(x);

Once you have numeric values, you can substitute the nan s with zeros:

nx(isnan(nx))=0

Answer 2

In the example you gave in the question there is a mixed content (strings and numbers), so it takes 2 steps:

x = {'11', 'NaN', 'NaN', '13', 24}; % last value is a number
isch = cellfun(@isstr,x); % find all strings
numx(isch) = str2double(x(isch)); % convert the strings to numbers, and place the correcly
numx(~isch) = cell2mat(x(~isch)); % extract the numbers and place the correcly

Then you can replace all NaN s with zeros:

numx(isnan(numx)) = 0;

the result:

numx =

    11     0     0    13    24