Round coefficients of symbols
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I have a solution matrix with equations and coefficients in front of symbols. I want to round them to a certain decimal.
example: X=[1.89545464564*S+0.00000085*M, 1.00000055*S-0.68129354234*M; 0.00000000345*S+0.00000346*M, 1.00004353*S+1.68129354234*M];
How to round the coefficients that are in front of S and M in my matrix to something like 2 or 3 decimal places.
Thank you!
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Answers (4)
Andrei Bobrov
on 19 Jun 2013
syms M S
X=[1.89545464564*S+0.00000085*M, 1.00000055*S-0.68129354234*M; 0.00000000345*S+0.00000346*M, 1.00004353*S+1.68129354234*M];
out = vpa(X,4);
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Image Analyst
on 7 Nov 2014
Use the second argument for round(). From the (R2014b) help for round():
Y = round(X,N) rounds to N digits:
N > 0: round to N digits to the right of the decimal point.
N = 0: round to the nearest integer.
N < 0: round to N digits to the left of the decimal point.
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Carlos
on 8 Dec 2022
Hope it's not too late:
syms M S
X=vpa([1.89545464564*S+0.00000085*M, 1.00000055*S-0.68129354234*M; 0.00000000345*S+0.00000346*M, 1.00004353*S+1.68129354234*M]);
for i = 1:length(X)
Coef = coeffs(X(i));
for j = 1:length(Coef)
if Coef(j) < 0.001 %you can change 0.001 to adjust precision
X(i) = subs(X(i),Coef(j),0);
end
end
end
X = vpa(X,5) %use vpa becouse the function subs adds unwanted decimals.
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