Read multiple text file in Arduino ide
You could do something similar to this. Though you will need to check the proper behaviour of parseFloat() when it doesn't detect a float value, ie., what it actually returns.
while(file) {
int length = readFile(arr, file);
file.close();
handleArray(arr, length);
file = root.openNextFile();
}
...
int readFile(float *arr, File f) {
int i = 0;
float val = 0.0;
val = f.parseFloat(); // returns 0.0 when no float was found?
while (val > 0.0) {
arr[i++] = val;
val = f.parseFloat();
}
return i;
}