When using the 'set_param' function, how do I ensure that I format the parameter value properly when the parameter value is a 1xn array?

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I'm trying to simulate a simple Doppler Radar and I need to change the frequency offset value per simulation, however this requires me to change the RFConfiguration block's fundamental tones, so I've written some code that's all working fine apart from this particular line:
set_param('Radar_Simulation/Configuration', 'Tones', [num2str(frequency_offset), num2str(f), num2str(f+frequency_offset)]);
As this gives the fundamental tones as:
When they should be:
'[0.0055558 1000000 1000000.0056]'
So clearly whatever have done is taking into account the commas within my array or the square brackets themselves.

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