MATLAB不用科学计数法写入数据至txt - 那抹阳光1994

MATLAB不用科学计数法写入数据至txt

dlmwrite(filename,file,\'delimiter\',\',\',\'newline\',\'pc\',\'precision\',\'%.7f\');

设置精度就不会将科学计数法的数据写入到txt文件中去。

matlab中保留有效位数

通过 vpa可以仅保留有效位数

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]