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exp-mantissa part alone

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x
x 2011-9-11
x=4096; expx = large_exp(x) disp(expx);
how to get only the first part(mantissa part of the answer alone to find exponential and use it in program

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采纳的回答

Walter Roberson
Walter Roberson 2011-9-11
x=4096; expx = large_exp(x); mantissa = expx(1);
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x
x 2011-9-12
sir where to use the format?why these mantissa values are different ?where to use format sir
Walter Roberson
Walter Roberson 2011-9-12
As the first executable line of your program, put
format long g
After that, you will not get those silly 1.0e+007 * displays, and you will be able to see why the mantissa showed up as 1.3375 instead of 0.000 .

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更多回答（1 个）

the cyclist
the cyclist 2011-9-11
I am not sure what you mean by large_exp(). I assume it is a function you wrote, or maybe it is in a toolbox that I do not have. Regardless, I expect that you can get at what you need by using the floor() function.
  2 个评论
x
x 2011-9-11
inorder to calculate exp me used a function call and it gives expx =
1.0e+003 *
0.0074 1.7780 as my value for fimdimg exp(4096) the ans is the mantissa part alone ie)i want to get only 1.0e+003 *
0.0074 alone for this wt is to b done
x
x 2011-9-11
function expx = large_exp(x)
t = x/log(10);
expx = [10^(t-floor(t)), floor(t)];
this s the fuction pgm

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