Extracting double from endless serial string

Hey guys,

I am using fscanf to read from a serial port. The data I can read looks like this:

'2.304X+ 102.304X+ 102.304X+ 102.304X+ 1'
or 
'.225X+   1.225X+   1.225X+   1.225X+   1.2'

All I want to do is to extract the 102.304 or the 1.225 as a double. The message has 7 characters

Right now I am doing it like this:

Live = fscanf(Serial,'%s',19);          % Scanne den GMS
Value = extractBetween(Live,'+','X'); % Extrahiere die Zahl aus String
Final_Value(y,1) = str2double(Value); 

I read 19 digits, so I can be sure to get the whole message.

It works so far, but is there a way to extract the double in a more elegant way?

Would be super nice if someone could help me!

Answer 1

[David Goodmanson]

Hi Marcel,

Here is another way. It produces one copy of the number whereas in your case str2double(Value) produces a 3x1 matrix before it is assigned to Final_Value(y,1) in some manner. So there is that difference. And similar to what you are doing, you have to read in enough to be assured of two + signs.

Live = '2.304X+ 102.304X+ 102.304X+ 102.304X+ 1';
ind = find(Live == '+')
str2double(Live(ind(1)+1:ind(2)-2))

[Marcel Glomp]

Nice! Works great. Thank you

Answer 2

[madhan ravi]

str2double(regexp(Live,'(?<=+.*)(\d+)?.?\d*(?=X)','match')).'