Separating and sorting a character string of magnetometer data (X,Y,Z,temperature) into separate arrays of doubles

I am working on a project where I am taking I2C data from a magnetometer>arduino>matlab. The data comes in as a character string, example: X-123.3 Y30.3 Z500.4 t24.5, randomly pulls data so the string starts at a random reading or even part way through a value.

I am having issues getting the code to run consistently without throwing the error "Conversion to double from cell is not possible." when I try to sort the separated data into individual arrays for each axis and temperature. I have attached the .m file and copied the code below. Any assistance would be greatly appreciated.

s1 = serialport('/dev/tty.usbserial-1440', 9600);

fopen('s1');

n = 300;

j=linspace(1,n);

k=1:25;

for i=1:length(j)

data = read(s1,n,"char");

data_split = strsplit(data);

end

for m=1:length(k)

data_tem = data_split(m);

data_t = char(data_tem);

if data_t(1) == 'x'

cx(m,:) = data_tem; %%ERROR THROWN HERE

elseif data_t(1) == 'y'

cy(m,:) = data_tem;

elseif data_t(1) == 'z'

cz(m,:) = data_tem;

elseif data_t(1) == 't'

temp(m,:) = data_tem;

end

end

cx = cx(~cellfun('isempty', cx));

cx = char(cx);

cx(:,1) = [];

cx = str2num(cx)

%magX = abs(magX);

calx = average(cx)

cy = cy(~cellfun('isempty', cy));

cy = char(cy);

cy(:,1) = [];

cy = str2num(cy)

%magY = abs(magY);

caly = average(cy)

cz = cz(~cellfun('isempty', cz));

cz = char(cz);

cz(:,1) = [];

cz = str2num(cz);

cz = abs(cz)

calz = average(cz)

clear s1

If more information is needed please let me know and I will happily provide.

Answer 1

[Stephen23]

>> str = 'X-123.3 Y30.3 Z500.4 t24.5';
>> tkn = regexpi(str,'([A-Z]+)(\S+)','tokens');
>> tkn = vertcat(tkn{:})
tkn = 
    'X'    '-123.3'
    'Y'    '30.3'  
    'Z'    '500.4' 
    't'    '24.5'  
>> vec = str2double(tkn(:,2))
vec =
       -123.3
         30.3
        500.4
         24.5

[Alex]

Worked perfectly, thank you very much Stephen!