dlmwrite(filename,file,'delimiter',',','newline','pc','precision','%.7f');
設置精度就不會將科學計數法的數據寫入到txt文件中去。
matlab中保留有效位數
通過 vpa可以僅保留有效位數
vpa Variable precision arithmetic.
R = vpa(S) numerically evaluates each element of the double matrix
S using variable precision floating point arithmetic with D decimal
digit accuracy, where D is the current setting of DIGITS.
The resulting R is a SYM.
vpa(S,D) uses D digits, instead of the current setting of DIGITS.
D is an integer or the SYM representation of a number.
It is important to avoid the evaluation of an expression using double
precision floating point arithmetic before it is passed to vpa.
For example,
phi = vpa((1+sqrt(5))/2)
first computes a 16-digit approximation to the golden ratio, then
converts that approximation to one with d digits, where d is the current
setting of DIGITS. To get full precision, use unevaluated string or
symbolic arguments,
phi = vpa('(1+sqrt(5))/2')
or
s = sym('sqrt(5)')
phi = vpa((1+s)/2);
Additional examples:
vpa(pi,780) shows six consecutive 9's near digit 770 in the
decimal expansion of pi.
vpa(hilb(2),5) returns
[ 1., .50000]
[.50000, .33333]