problem sending data from matlab to arduino uno via bluetooth

Hi, i'm trying to sending data from matlab to arduino via bluetoorh I successfully sended a pulse and byte but when I declare the received data in arduino as double and start communication the actual value in matlab isn't equal to the received one and all negative value received as zero (there are no negative values received ) Am using fwrite function in matlab to write through serial port and I declare data as double

I forget to say that all received number appear as integrs while they are not actually an integers