I want to run harmoney search algorithm in matlab, and my data set is the number of feature saved in excel with 11 column, I read my file from excel with this command A=xlsread(filename); in matlab, and my file has the value of 0 1 and decimal number, but when I run my program I get NaN instead of decimal number in the out put. so I get NaN value for my best cost, how can I fix this problem?
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I have a matrix of order 3 x 3, and all elements of matrix are up to 6 decimal place. I want to display this elements of matrix only up to 5 decimal place. I used format short and format long, but it gives either 4 or 15 decimal places.
Is there a command that gives up to any particular decimal places?
I have idea for a single number but could not solve for all entries of a matrix.
The builtin format options cannot handle this. You'll instead want to use fprintf or num2str (with a format specifier) to force the appearance of the number
data = rand(3) * 100;
num2str(data,'%12.5f')
% 20.42155 3.95486 91.50871
% 9.28906 87.24924 72.61826
% 47.43655 95.70325 94.41092
If you want to make this the default display at the command line you could overload the builtin display method for double but I would not recommend that.
Alternately, you can use vpa to specify the number of significant digits to display (note that the second input is the number of significant digits and not the number of numbers after the radix point).
vpa(data, 5)
I have matrix with elements have small values. I am taking product of some elements of matrix for 100 times. If I take matrix 10*10 then it shows output but when I take matrix 100*100 then it shows 0. I think it shows 0 because product appears very small value. so how to take product so this small value should display.
Try typing:
format long
It should be just and rounding problem. This will format it to 8 decimals. If you want to go back to Matlab default settings type:
format short
I want to write a matrix 25 by 8 with each column represent a bit value and also want to make it a fixed point binary representation i.e. i want to write binary in decimal as
0000.1000 = .5 so in this expression the binary fixed point is at mid
So like wise a matrix
s=[0000.1000;
0000.0100;
........
.....
0000.1100]
I want to keep this format for the whole matrix or something like that and also whos command will show me the class as binary. Thanks
I have numbers with upto 10 decimal points stored in a text file.
I read it in MATLAB and then do str2double on the number but i get only upto 4 decimal points. What should I do to get all the values after decimal.
Forexample:
str2double('-122.345464646')
ans =
-122.3455
but I need the entire number
Thanks
Please follow the below steps:
Go to preference
List item
Go to Command Window Option
Then change the numeric format to long g
Alternatively, type long g in command window
I wanted to create a vector with three values 1/6, 2/3 and 1/6. Obviously I Matlab has to convert these rational numbers into real numbers but I expected that it would maximize the precision available.
It's storing the values as doubles but it's storing them as -
b =
0.1667 0.6667 0.1667
This is a huge loss of precision. Isn't double supposed to mean 52 bits of accuracy for the fractional part of the number, why are the numbers truncated so severly?
The numbers are only displayed that way. Internally, they use full precision. You can use the format command to change display precision. For example:
format long
will display them as:
0.166666666666667 0.666666666666667 0.166666666666667
So the answer is simple; there is no loss of precision. It's only a display issue.
You can read the documentation on what other formats you can use to display numbers.
you can not store values as 1/2 or 1/4 or 1/6 in to a Double variable... these are stored as decimals behind the system; if you want to store these values , try storing it as string that would work;
Whenever you want to make mathematical calculation using these strings then convert the value into number and continue....