How to specify coefficients of variable terms in ODE system

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saheed
saheed 2014-9-18
Hi everyone,
I need to specify the coefficients of the ODE variables g and f as a predetermined variables but matlab only accepts numerical values as coefficients of its differential variables. Is there any way to fix this?
[f, g] = dsolve('D2f == A*f + B*g', 'Dg == C*f + H*g')
where A, B, C and H are predetermined terms.
Thanks in advance.

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