Rearrange Variables in an equation that are changing everytime
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I want to get one variable in terms of the other variables in the equation. For example
syms a b
eqn = ('a + 2*b = 1')
v_a = solve(eqn, a)
v_b = solve(eqn, b)
This works fine
My issue is that the variables and the number of variables can change in each iteration.
My variables alpha1, alpha2 and alpha3 are defined by sym and not syms. I need to do this as the no of alpha's is determined by the input data size. This case 3.
data = [-1 0 1;-1 +1 -1]';
alpha = sym('alpha',[1 3]); %output "[ alpha1, alpha2, alpha3]"
st = 'alpha*data(:,2)=0' %output should be "alpha2 - alpha1 - alpha3 = 0" but I dont get this. instead, its something else
v_2 = solve(st,alpha(1)) %doesnt work because the previous line is wrong
Thanks and appreciate any help
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Akzeptierte Antwort
Star Strider
am 20 Jul. 2012
This:
data = [-1 0 1;-1 +1 -1]';
alpha = sym('alpha',[1 3]);
advct = alpha * data(:,2)
v_2 = solve(advct == 0, alpha(1))
gives me these:
advct =
alpha2 - alpha1 - alpha3
v_2 =
alpha2 - alpha3
Is that the result you were hoping for?
6 Kommentare
Star Strider
am 21 Jul. 2012
My pleasure! We are here to help.
And thank you again for accepting my answer!
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