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• bloc2exp
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• ssrand
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• sysdiag
• syslin
• trfmod

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r=sysdiag(a1,a2,...,an)

s=poly(0,'s')
sysdiag(rand(2,2),1/(s+1),[1/(s-1);1/((s-2)*(s-3))])
sysdiag(tf2ss(1/s),1/(s+1),[1/(s-1);1/((s-2)*(s-3))])