How can I read data from the arduino serial monitor using Matlab?

I am trying to read the outputs of my Arduino serial monitor to graph them in Matlab. The serial monitor reads the data correctly, they are force values from 4 load cells. However, when using fscanf to read the serial monitor using Matlab, the data comes across as 0.0000 or -0.1200, which is what the load cells display during no load. How can I have Matlab read the actual values from the serial monitor rather than always getting these incorrect values? My code is the following:

 handles.UltraM = serial('COM6','BaudRate',9600,'Timeout',10000000);
 fopen(handles.UltraM);

 %the code below is in a while loop with the variable "some_number" moving actuators to change the force exerted on the load cells

 fprintf(handles.UltraM,'%s\n',(['<P' some_number '>'])); %input into the serial monitor to move the actuators, which works
 data = fscanf(handles.UltraM);
 [s1 s2] = strread(data, '%f %f','delimiter',', ');
 s1_data = s1;
 s2_data = s2;

The Arduino code that inputs a string into the serial monitor is:

 Serial.println(String(sumForce) + ", " + String(int(yPos)));

The resultant codes display 2 numbers on the serial monitor. The first is a force reading (95.0000) and the second is a position (1300). They are displayed being separated by a comma and a space. In Matlab, the variable named "data" displays 0.0000, 0 or -0.1200, 600 which are the values that the serial monitor displays only when no force is exerted.

[Hans Scharler]

What are you building? I will help get you an answer as well.

[Zack]

A machine containing actuators that are attached to a force plate, which move to mimic the human gait cycle.