how i can change the speed of spi from matlab?

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aos abs el 13 de Nov. de 2018

Editada: aos abs el 14 de Nov. de 2018

i use raspberry pi 3 B+ and i want to change the speed from 500KHz to 4MHz

but i couldn't.I used "spidev" but the speed didn't change.

how i can change the speed of spi?

i used:

board = targetHardware('Raspberry Pi');

deploy(board,'Matlabfilename')

Matlab give this error "?? Nontunable property 'BusSpeed' may only be assigned once."

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