I want to run MATLAB 2015b algorithm on Android device through NDK. So I need a standalone c code from algorithm. I used Matlab Coder for this, But I get this error:
The function 'bwboundaries' is not supported for standalone code generation. See the documentation for coder.extrinsic to learn how you can use this function in simulation.`
I used this function in this way:
[B,L]=bwboundaries(h1);
the h1 is an 280*500 logical array which comes from a Black & White image.
I searched and found this list: Functions and Objects Supported for C and C++ Code Generation
As we see there the bwboundaries declared in the list:
bwboundaries :
The conn and options arguments must be compile-time constants and the return value A can only be a full matrix, not a sparse matrix.
If you choose the generic MATLAB Host Computer target platform, generated code uses a precompiled, platform-specific shared library.
MATLAB Function Block support: No.
I don't understand it!! How should I use this function to have its c code?
OR Is there any function to use instead?
I see this SO questions which didn't help me:
q1 q2 q3
Related
I have an m file from which I use to create dll using the Matlab deploytool. the code simply reads as:
function hello
disp('Hello')
end
there are six functions in the compiled dll exported as:
uint8 helloInitialize
[uint8, voidPtr, voidPtr] helloInitializeWithHandlers(voidPtr, voidPtr)
helloPrintStackTrace
helloTerminate
uint8 mlfHello
[uint8, MATLAB arrayPtr, MATLAB arrayPtr] mlxHello(int32, MATLAB arrayPtr, int32, MATLAB arrayPtr)
Now I want to run this dll from my matlab command window using calllib and use
the hello function. Assuming that I use the correct function mlfHello, calllib('hello','mlfHello') gives me nothing. Please advise me on what function to call and how to do it?
I'm not 100% its still the case but it certainly used to be that you couldn't load DLL's which were created in Matlab back into Matlab.
I suspect its still the case - so you cant do what your trying to do.
[edit] I dont have a link because they dont like to advertise the fact. The reason AFAIK is to avoid users compiling toolbox capability into DLL and giving to others to use in Matlab without a toolbox license.
I = imread('baboon.jpg')
Inimage = imguidedfilter(I)
imshow(Inimage)
Error: Undefined Function imguidedfilter
But when I search there appears to be a function by this name. Why?
MATLAB is regularly updated with new functions, and there are also multiple toolboxes (with their own updates). So the functions you can use depends on your version of MATLAB. Unfortunately it is not easy to find out in which version of MATLAB a function first became available.
You can use these functions to get some more information:
ver - to see what MATLAB version you have and which which toolboxes you have access to.
which - to see if a particular function is on your MATLAB path
e.g. which imguidedfilter will show you if you have access to the function imguidedfilter.
This particular function appears to be a very new function which you may need R2014a for (as I have R2013b and Image Processing Toolbox and don't have it).
I have few continuous variables that look like this:
durs1=[3,40933 0,033630 0,25103 0,6361 0,71971 1,18311 1,91946 0,12842 0,97639 1,1383 0,46871 3,05241 2,34907 1,03788 0,76434 1,08798 1,462 0,4241 2,32128 0,29017..]
Each has more than 1000 values (all positive). I used
[a, b]=gamfit(durs1)
a =
2.3812 0.4200
b =
2.2316 0.3907
2.5408 0.4514
to find parameters of gamma distribution. Now I want to make a goodness of fit test in order to see how well the model fits my data. Matlab provides the one sample Kolmogorov-Smirnov test to solve the problem (http://www.mathworks.com/help/stats/kstest.html#btnyrvz-1)
But when I run my code (based on their examples):
test_cdf=makedist('Gamma','a',2.38,'b',0.42)
[h, p]=kstest(durs1,'CDF',test_cdf)
I have this error: "Undefined function 'makedist' for input arguments of type 'char'."
Can somebody help me to fix my code?
It seems like the function makedist of the statistics toolbox is available only from Matlab version r2013a. Looking in the documentation of earlier versions, even as late as r2012b, there is no mention of makedist. So I think updating to the latest version of matlab should solve your problem.
In MatLab, "> help bi2de" provides the following example:
B = [0 0 1 1; 1 0 1 0];
D = bi2de(B)
But when I try this on my own, I get the following error:
??? Undefined function or method 'bi2de' for input arguments of type 'double'.
Is there something wrong with this function in MatLab?
I am pretty sure that the reason why this problem happened is because of the license of the toolbox, Communications system toolbook, in which this function belongs in. Write which bi2de and see what will be the result. If it returns path of the function and the comment Has no license available, then the problem is related to the license. That means, license of the toolbox is not set correctly. Mostly it happens if the toolbox is added later, i.e., after installation of the original matlab. Please check and solve the license issue, then it will work fine.
bi2de is a function in the Communications toolbox. You need to have that toolbox to use it. If you do have that toolbox, then the problem is that your B matrix is being treated as double instead of binary (I don't have the toolbox so I can't test this).
Consider using bin2dec, which turns a string representation ('1011001', eg) into a decimal number. This function is not part of a toolbox; it's available as part of the basic MATLAB package.
I want to know how can this function(from MATLAB) resize the columns of an input image using weights an indices previously computed.
Which equations uses to do that?
resizeColumnsCore(double(in), weights', indices');
When I looked for a function called resizeColumnsCore in MATLAB 7.11.0 (R2010b) I didn't find anything. However, I did find a MEX-file by that name in MATLAB 7.8.0 (R2009a) in this subdirectory of the Image Processing Toolbox:
C:\Program Files\MATLAB\R2009a\toolbox\images\images\private\
I guess they've phased it out or replaced it with another function in newer MATLAB versions. Now, if you want to know what the MEX-file does, you need to look at the source code it is compiled from. Luckily, it appears that this source code resizeColumnsCore.cpp can be found in the following directory:
C:\Program Files\MATLAB\R2009a\toolbox\images\images\private\src\misc\
And you can look through that code to determine the algorithms used to resize the columns of an image given a set of weights and indices.
Now, if you want to know how these input arguments to resizeColumnsCore are computed, you'll have to look at the code of a function that calls it. I know of at least one function in the IPT that calls this function: IMRESIZE. If you type edit imresize at the command prompt it will open that function in the Editor, allowing you to look through the code so you can see how the arguments to resizeColumnsCore are created.
What I can tell you for R2009a is that there is a subfunction in the file imresize.m called contributions which computes the weights and indices that are ultimately passed as arguments to resizeColumnsCore. That is where you will want to start looking to determine what algorithms are used to compute these arguments.
Looks like this isn't a proprietary MATLAB function. Could we see some code or a link to the code?