Decreasing digits of answer
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Hello,
grad =

I have an output like this, but I want at most 6 digit of numbers. How can I change it? Please help me.
Thank you so much
Risposte (1)
Paul
il 6 Giu 2023
Try:
vpa(grad,6)
9 Commenti
John Adams
il 6 Giu 2023
Paul
il 6 Giu 2023
Can you post the the code that generates grad, or save it to a .mat file and post add it to your question using the paper clip icon. Hard to help without being able to recreate the results.
John Adams
il 6 Giu 2023
Modificato: Walter Roberson
il 6 Giu 2023
syms x y
x1=2.234;
y1=2.24;
x2=5.34;
y2=5.5452;
x3=2.123;
y3=5.153;
x4=3.656;
y4=5.03;
x5=2.6001;
y5=6.253;
x6=1.933;
y6=3.411;
A= [1 x y x^2 x*y y^2]
B= [1 x1 y1 x1^2 x1*y1 y1^2;1 x2 y2 x2^2 x2*y2 y2^2;1 x3 y3 x3^2 x3*y3 y3^2;
1 x4 y4 x4^2 x4*y4 y4^2;1 x5 y5 x5^2 x5*y5 y5^2;1 x6 y6 x6^2 x6*y6 y6^2;]
invB= inv(B)
C= A * invB
vpa(C,6)
But what I suspect you are looking for is
digits(6)
FPO = sympref('floatingpointoutput', true);
syms x y
x1=2.234;
y1=2.24;
x2=5.34;
y2=5.5452;
x3=2.123;
y3=5.153;
x4=3.656;
y4=5.03;
x5=2.6001;
y5=6.253;
x6=1.933;
y6=3.411;
A= [1 x y x^2 x*y y^2]
B= [1 x1 y1 x1^2 x1*y1 y1^2;1 x2 y2 x2^2 x2*y2 y2^2;1 x3 y3 x3^2 x3*y3 y3^2;
1 x4 y4 x4^2 x4*y4 y4^2;1 x5 y5 x5^2 x5*y5 y5^2;1 x6 y6 x6^2 x6*y6 y6^2;]
invB= inv(B)
C= A * invB
sympref('floatingpointoutput', FPO) %restore setting
John Adams
il 6 Giu 2023
John Adams
il 6 Giu 2023
Modificato: John Adams
il 6 Giu 2023
Walter Roberson
il 6 Giu 2023
The sympref always uses 4. I misled when I showed digits(6) as if it controlled the output digits for the sympref
Paul
il 6 Giu 2023
To be clear, 'floatingpointoutput' = true only affects the display of results, not the results themselves.
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