How can I increase the decimal digits in the result of my program ? for example 50 or 80 digits .

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khalid boureeny
khalid boureeny 2017-1-27
评论： Star Strider 2017-1-27
format long
x=(pi);
for i=1:10
fx=cos(x(i))-3*x(i)+1;
fxx=-sin(x(i))-3;
x(i+1)=x(i)-(fx/fxx);
end
x(10)
% THE RESULT IS = 0.607101648103123

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回答（1 个）

Star Strider
Star Strider 2017-1-27
If you have the Symbolic Math Toolbox, you can use it. Another option is John D’Errico’s HPF - a big decimal class in the File Exchange.
  2 个评论
khalid boureeny
khalid boureeny 2017-1-27
编辑：per isakson 2017-1-27
Hi, Star Strider ...thanks a lot for your help ...
I do have Symbolic math toolbox , but the problem is I'm beginner and I don't know how ... can you modify this program for me ...
format long
x=(pi);
for i=1:10
fx=cos(x(i))-3*x(i)+1;
fxx=-sin(x(i))-3;
x(i+1)=x(i)-(fx/fxx);
end
x(10)
% THE RESULT IS = 0.607101648103123
THANKS again , I really need that help ... khalid_boureeny@yahoo.com
Star Strider
Star Strider 2017-1-27
My pleasure.
Declare ‘x’ as as symbolic object, and the result will be symbolic with the precision defined by the digits function:
digits(50);
x= sym(pi);
for i=1:10
fx=cos(x(i))-3*x(i)+1;
fxx=-sin(x(i))-3;
x(i+1)=x(i)-(fx/fxx);
end
x_10 = vpa(x(end))
x_10 =
0.60710164810312263122482837345049072888916774532395

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