get rid of e notation

2011 7 12
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how do i get rid of the e notation in a variable? eg 4.321e+003, i just need it as 4321. its stopping me from plotting a graph.

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Walter Roberson
Walter Roberson 2011-7-12

0 个投票

Sounds to me as if you have accidentally created a variable named "plot".
In the mean time, use round() on your data and see if you get a plot out. My guess is that you will not.

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Paulo Silva
Paulo Silva 2011-7-12
Walter that's a good assumption, let's see if it's correct or not, I'm very curious about it.
Naveen Francis
Naveen Francis 2011-7-12
no i havent created a variable called plot. atleast its not shown in the workspace. and your guess is right, round doesnt work.
Walter Roberson
Walter Roberson 2011-7-12
Okay, we need to see your code, and we need to see the traceback of the error. Please also show us
which -all plot
Naveen Francis
Naveen Francis 2011-7-12
here's the code -
h=wavread('song1.wav');
>> plot(h)
>> plot(h)
>> [sums,peak,onset] = SF3('song1.wav');
Elapsed time is 0.351198 seconds.
>> z=onset*44100;
>> hold on
>> plot(z,a(z),'*r');
??? Subscript indices must either be real positive integers or logicals.
Naveen Francis
Naveen Francis 2011-7-12
however, it seems to work when i tried another example -
d=[12143 34234 234252 656 5757575 34 344423 2 98989809 23578032 28272293 2626384738 33983 399839 988 6364536546 8787 3434 535838 998798 2323 2387873 6767757 23565 76767 9898 232323 98989 34343 767676];
>> r=1:30;
>> plot(r,d(r))
works fine here (scratching head)...
ne clues??
Walter Roberson
Walter Roberson 2011-7-12
What is "a" ? If it is an array, then a(z) would be attempting to subscript "a" by the values in "z".
If "a" is an array and you are expecting that "z" will work out as integral, then you might be experiencing floating point roundoff limitations; if so then a(round(z)) should work (unless some z rounds to zero.)

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更多回答（2 个）

Friedrich
Friedrich 2011-7-12

0 个投票

Hi,
have a look at the format function:
http://www.mathworks.com/help/releases/R2011a/techdoc/ref/format.html
So this should work
format long
Paulo Silva
Paulo Silva 2011-7-12

0 个投票

No it's not stopping you unless the variable is a string instead of a number, please provide more details.

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Naveen Francis
Naveen Francis 2011-7-12
unfortunately, it is stopping me. the array is in 'double' format. the plotting works correctly only if i change the e notation manually. here's the message i get while plotting -
"??? Subscript indices must either be real positive integers or logicals."
Naveen Francis
Naveen Francis 2011-7-12
i guess the 'e' in the number must be interpreted as a character by matlab which is why its giving me an error while plotting.
Paulo Silva
Paulo Silva 2011-7-12
something doesn't seem right, please provide the code and a sample of the data

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