I have a file with data values of the order 10^(-6).When I try to read it in matlab, it just give me accuracy of 10^(-4).I used like below,
[y]=textread('report.txt','%f')
I tried to change %f to %0.6f, but still it does not work.
Then I try to read file as %s and use str2double, again same result.
0.004586 is just 0.0045
Please help me
Use format to change the precision.
The format function affects only how numbers display in the Command Window, not how MATLAB computes or saves them.
View current format: get(0,'format')
Set current format in present session to long using: format long
Set current format to long for successive session using : set(0,'Format',long)
long format offers 15 digits after the decimal point for double values, and 7 digits after the decimal point for single values.
Type help format for more details.
Update the format of your number like this:
matlab>> format long
Related
Currently looking at this API page, I have tried inputting format loose and format compact, but to no avail. What I need to do is change the way this number is displayed on the command window:
I obtain the value by rounding it to the three most significant figures in the function which I call from my main function.
stat = round(mean(v_stat),3,'significant');
I display the values through this statement:
fprintf('Ratio of Compression for Blind Deconvolution: %d \n',stat1);
I need to know how to display this value as as it's proper state instead of being multiplied by e raised to power of something.
You need to change your format statement, e.g. (a float with 3 decimals).
fprintf('Ratio of Compression for Blind Deconvolution: %.3f \n',stat1);
see the matlab help for fprintf to understand more on the format api.
Note: the %d your using is for integers
I have this problem that has been bothering me for quite a while.. I want to change the format of the number.. Don`t know how? Ive tried the help files but can't find the answer.. If you can help me please do..
There are three different things you could potentially be referring to when you talk about the "format" of a number: the display format, the variable storage format in memory (i.e. the data type/class), and the storage format in a data file. I'll address each...
Display format: As already mentioned by Amro, the display format can be adjusted with the FORMAT command. However, this only affects how the numbers are displayed, not how they are stored in memory.
Variable types/classes: There are a number of numeric classes, both floating point and signed/unsigned integer types, that variables can use. By default, MATLAB variables are stored as double-precision floating point numbers. To convert to other types, you can use the variable type as a function to recast a value. For example, a = uint8(0); converts 0 to an 8-bit unsigned integer type and stores it in a, while b = single(pi); converts the value pi into single-precision and stores it in b.
File storage format: When reading/writing numeric values to files, the type of file affects how it will be stored. A binary file (written to and read from using FWRITE and FREAD) stores the complete binary representation of a number, and can thus represent it as exactly the same type as it is stored in memory as a variable (double-precision, single-precision, 8-bit integer, etc.).
Alternatively, a text file (written to and read from using FPRINTF and FSCANF, among other functions) will store a value in a string format that you must specify when outputting the values to the file. You can specify the digits of precision, as well as the format (such as exponential notation or hexadecimal). The documentation for FPRINTF specifies these output formats.
Use the format command
Example:
format long; pi
3.141592653589793
format short e; pi
3.1416e+000
format short g; pi
3.1416
sprintf('%.2f', 1.4795e4);
(in particular: if you want it displayed/saved/printed a certain way, be explicit about it!)
I'm storing variable values in MATLAB and putting one of the variable values as part of the file name . e.g. "Error=1e-003.mat", however different version of MATLAB gives me different format when I'm converting numbers to string using num2str command. The number 1e-3, MATLAB2011 gives me 1e-003 and MATLAB2012 gives me 1e-03.
This runs into trouble when I try to load a batch of files with a mix of those two format. Does anyone know a way to add a zero or delete a zero for the exponent so the names are consistent? Or any other ways to solve this problem?
Here's a fairly robust way to do it:
A = num2str(YOUR_NUMBER, '%0.0e');
if A(end-2)=='-' || A(end-2)=='+'
A = [A(1:end-2) '0' A(end-1:end)]; end
In words: convert the number, and check if the second-to-last character is either a '+' or a '-'. If this is so, add a '0'.
Specify a "Format string as the second argument like this:
>> disp(num2str(2920230,'%0.10e'))
2.9202300000e+006
here %0.10e means display at least 0 digits before decimal and exactly 10 digits after it in exponent form.
I'm trying to use importdata for several data files containing data of a precision up to 11 digits after the decimal, is Matlab seems to think I am only interested in the first 5 digits when using importdata, is there an alternative method I could use to load my data, or a method to define the precision to which I want my data loaded?
First try:
format long g
Also, can you paste some of the data you are trying to load?
I have some large floating point numbers such as 1243564832.75 in MATLAB. MATLAB changes the format to 1.2435e09 or if I use long format: 1.2435648e09 or something like that.
Is there any way I can display the numbers in their non-engineering format (1243564832.75)?
Call the following command
format longG
Then the display should be "fixed"