Save double in txt with specific scientific notation format using writecell

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Marcelo Filipchuk
Marcelo Filipchuk 2022-2-16
回答： Walter Roberson 2022-2-21
I have a matrix with values in this format:
-4.33826930446975
-4.50867616174965
and I need them written in a *.txt file with this specific notation:
1.305911E-0002
1.101303E-0002
  7 个评论
显示 5更早的评论
Jan
Jan 2022-2-21
What have you tried so far and which problems occur? You can use sprintf('%E') and check, if the exponent have 2 or 3 digits. Then replace 'E+' by 'E+0' or 'E+00' (or with '-') accordingly. Alternatively determine the exponent manually using log(abs(x)) and print it and the mantissa using sprintf.

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回答（1 个）

Walter Roberson
Walter Roberson 2022-2-21
Ran in:
You probably should be more specific about the rounding or truncation you want to have done for additional digits after the 6th decimal point, paying attention to negatives and to which way '5' should go.
format long g
A = -4.33826930446975
A =
-4.33826930446975
B = 0.013059114373
B =
0.013059114373
fmt(A)
ans = '-4.338269E+0000'
fmt(B)
ans = '1.305911E-0002'
fmt(nan)
ans = '0.000000E+0000'
fmt(-inf)
ans = '0.000000E+0000'
function output = fmt(X)
if X == 0 || ~isfinite(X)
output = '0.000000E+0000';
return
end
D = floor(log10(abs(X)));
S = X./10.^D;
output = sprintf('%.6fE%+05d', S, D);
end

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