Separate a cell into separate numbers

I have 4 values in a cell format, like this way "-1,-2,-3.4,-4". I would like to separate this 4 values and use them as 4 different number? How can I do that?

Answer 1

[Walter Roberson]

If "1,-2,-3.4,-4" indicates a comma separated string, then

numstring = '1,-2,-3.4,-4';
numeric_values = sscanf(numstring,'%f,');

after which it is often best to leave them as an array.