How to separate positive and negative symbolic variables of an equation to the left and right sides of the equation in MATLAB?

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ehsan
ehsan 2015-11-28
评论： ehsan 2015-11-30
for example we have this equation : 3*a - 2*b + 5*c - d = 0 
First I need to separate positive and negative variables to both side of equation: 3*a + 5*c = 2*b + d
and then take only the coefficient of each symbolic variables: 3 + 5 = 2 + 1 
Thank you

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Walter Roberson
Walter Roberson 2015-11-29
syms a b c d
eq = 3*a - 2*b + 5*c - d;
constants = subs( children(eq), {a b c d}, {1 1 1 1} );
pospart = constants(constants>0));
negpart = -constants(constants<0));
sum(postpart) == sum(negpart) %this will usually be false

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