I am trying to do knnclassify on test_data(10000X784), train_data(50000X784), train_label(50000X1) and k = 1
And I am calling this function as follows:
label = knnclassify(test_data,train_data,train_label,k);
Background:
Where train_label is numeric equivalent digit of the data given in train_data. I want to classify my test_data. The data in both the train and test are in random order, but the train_label totally corresponds with the data in the train_data.
In my friend's workstation it works fine, but in my laptop it gives this error:
Undefined function 'knnclassify' for input arguments of type 'double'.
What could be the reason for the issue and how to solve it? Do I need to install any package? If yes how?
This error means that the function cannot be found in matlab, so you might missing the required toolbox. Just as #schorsch said you need to install the Bioinformatics toolbox.
A way to find out if the function is available in Matlab is typing which knnclassify. The output will be the route where the function resides or 'knnclassify' not found. otherwise.
Related
I want to use the MATLAB function "normalize" which normalizes the data to zero mean and unit variance. During the compilation, I still get the error:
Undefined function 'normalize' for input arguments of type 'double'.
Although this function support double inputs.
When I typed:
which normalize -all
I got:
C:\Program Files\MATLAB\R2017a\toolbox\signal\signal\#dfilt\normalize.m % dfilt method
Could any one help me please?
You're likely using a version of MATLAB older than R2018a, which is when the function normalize was first introduced. The which command is showing you a normalize method for dfilt class objects (from the Signal Processing Toolbox) that existed prior, which only accepts arguments of type dfilt.
I'm trying to implement with the matlab function imhistmatch.
So I use following commends.
A= imread('example1.jpg')
B= imread('example2.jpg')
C= imhistmatch(A,B)
But there is problem like this.
?? Undefined functionor method 'imhistmatch' for input arguments of type 'uint8'
So What am I suppose to do for solve?
I am not sure about your question. Are you trying to implement imhistmatch?
Then probably your function is in the wrong folder or you have a typo in the functions name.
use
addpath('Pathto/imhistmatch')
to ensure that matlab can find your implemented function.
But maybe you want to use the function imhistmatch provided by the image processing toolbox. Then, I guess you don't have the image processing toolbox.
Try
ver
and check the output. You should find these lines:
MATLAB Version X.X (XXXXX)
Image Processing Toolbox Version X.X (XXXXX)
If not, then you may want to buy the image processing toolbox, get a evaluation version or maybe try octave.
On my computer the following works:
imhistmatch(ones(10),ones(10))
imhistmatch(ones(10,'uint8'),ones(10,'uint8'))
but when I type
imhistmatch(ones(10,'int8'),ones(10,'int8'))
I get an error:
Error using imhistmatch
Expected input number 1, A, to be one of these types:
uint8, uint16, double, int16, single
Instead its type was int8.
...
So, if it would be a type problem you would see another error.
Your error is the result of not having the proper function imhistmatch.
I have already seen the link Error using fzero in Matlab: Undefined function or method 'det' for input arguments of type 'function_handle'
But I am unable to solye my problem with this link.I am working with fi object in MATLAB. I have one matrix T_1 (2 cross 2) which is conevrted into the fi(T_1,1,32,26,fimath), i.e 32 signed binary number and 26 is the positon of binary point. Now when I try to excute the follwing code
T = mat_G/(mat_sqrt_D)
T_1=fi(T./mat_E,1,32,26,fimath);
multiplier=1/(2*sqrt(det(var_oldS))*abs(det(T_1)));
follwing error appears
Undefined function 'det' for input arguments of type 'embedded.fi'.
So can anyone tell me how can i fix it.
P.S variable var_oldS, mat_G,mat_E, mat_qrt_D has the same fi object properties i.e fi(variable_name,1,32,26,fimath)
If you check the documentation for det, it says that the input must be single or double. Fixed point is probably not supported. As your matrix is of fixed size 4, it's simple to replace the function:
det2=#(M)M(1)*M(4)-M(2)*M(3)
Then use det2 instead of det.
I'm trying to convert a CSV file to LIBSVM/SVMlight format. I found the following code to do it:
SPECTF = csvread('SPECTF.train'); % read a csv file
labels = SPECTF(:, 1); % labels from the 1st column
features = SPECTF(:, 2:end);
features_sparse = sparse(features); % features must be in a sparse matrix
libsvmwrite('SPECTFlibsvm.train', labels, features_sparse);
I used it on Octave on a specific file, and it worked properly.
However, when trying it on MATLAB, I received the error:
Undefined function 'libsvmwrite' for input arguments of type 'char'.
Neither "labels" nor "features_sparse" are chars... (they are doubles). Where is my error? Thanks!
The first argument for libsvmwrite is of type char ( the filename 'SPECTFlibsvm.train'). I think the problem is on the error message given by Matlab. The error message says that the function doesn't exist for input of type char, but most likely it should be that it doesn't exist at all (the message could maybe make sense if Matlab was designed as an OPP language).
Anyway, you simply don't have the libsvmwrite function in your path, or you somehow messed up the installation of the libsvm interface.
Probably you loaded only the source code, which is written in c. You need to compile it. Go to the matlab directory of libsvm and read the instructions.
So I have imported RGB photo into my Matlab workspace. It says it has value: <200x200x3 uint8>. Meaning it has class uint8. And its name is: prettyPic. So when I try to do the following:
% Convert prettyPic to vector format using function imstack2vectors.
[prettyPic, L] = imstack2vectors(prettyPic);
I get the following error:
??? Undefined function or method 'imstack2vectors' for input
arguments of type 'uint8'.
I was searching google all around reading the Matlab help and even trying to give 'imstack2vectors' different types of variables only to find that none works.
So the question is what type of picture should I feed the 'imstack2vectors' with. And how can I convert the picture that I have to that format/class.
I am a begginer in Matlab so any help would be greatly appreciated!
??? Undefined function or method 'imstack2vectors' for input arguments of type 'uint8'.
Means that most likely, the function imstack2vectors does not exist on your Matlab path (i.e Matlab cannot find a function of this name).
Type which imstack2vectors to see whether Matlab can find it on the path. If it returns nothing, but you know where the function is on your hard drive, you can change directories in Matlab to where the function is located, and then run your command again.
In general, you may want to learn about adding functions to the Matlab path.