2 problem with minspantree.m in Matlab 2018a
Hi dear all; I want to find a min-span-tree of a matrix. I figured that MATLAB's own minspantree.m may be the most efficient algorithm. So i use
open minspantree.m
And here comes Question:
1.The code in minspantree.m used G.EdgeProperties.Weight and G.Underlying. G is a graph object. But when I use G.EdgeProperties.Weight or G.Underlying in Command window, both returns error: Error using graph/subsref (line 15) No public property 'EdgeProperties' for class 'graph'. Why?
2.minspantree.m line 62：
[pred, edgeind] = primMinSpanningTree(G.Underlying, w, rootNode, restart);
Is primMinSpanningTree a function? But I can not find any: function [ ] = primMinSpanningTree() in minspantree.m, neither can I find primMinSpanningTree.m file in my whole disk. So what is primMinSpanningTree? What is its code? How can I find it and open it?
Thanks all very much.
Both EdgeProperties and Underlying are private properties of the graph class. They can only be accessed from within the class. Take a look at Graph.m. minspantree is a class method, so it has access.
primMinSpanningTree is a built-in method from matlab.internal.graph.MLGraph. You can see that with which primMinSpanningTree. So I believe the code might not be accessible.
Related
I'm actually trying to build a Stateflow with Matlab code
I would like to know if it's possible to retrieve the Handle of a State block. I tried to use get_param() :
state_handle = get_param('System/Chart/State_ON', 'Handle');
But it returns me :
No block called 'State_ON' could be found.
Is there another solution to get Handle using the name of the state?
Edit : i found and post a solution
Ok after many research there are 2 solutions :
For version R2017b and after
StateHandle = StateFinder(Chart Handle)
For versions before R2017b
state_handle = ch.find('-isa','Stateflow.State','-and','Name', 'State_ON');
I'm using App Designer in MATLAB. I have created a push button, 51-54 work no problem, then when I assigned another function into it (highlighted in the screenshot), it wouldn't work!
Please help me overcome this problem.
Screenshot showing the problem:
Problem: function inside of a function the way it is written in the screenshot.
4 things come up my mind:
Generally:
yourApp.mlapp or any other code.m file
function someProcess()
end
function subProcess()
end
In your case rather try to write your function in an second .m file and call it from within your your app.
be sure to have it on the MATLAB path.
yourApp.mlapp or any other code.m file
function someProcess()
subProcess();
end
+ external code.m file
function someProcess()
subProcess();
end
define your function as a public or private function (method) inside the app. ( for others: the block is not there by default. click: app designer> code view > function > add private function | add public function)
screenshot
if your function is only used once you could also write an anonymous function
https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html
Trying to create my first class in MATLAB but obviously am missing something.
So here is my class below.
classdef MyBank
properties
Balance;
CustName;
end
methods
function BA = MyBank()
BA.Balance = 0;
BA.CustName = 'Mr Blogs'
end
end
end
In the same path I have a m file. In this file I try to create an object from my class like so,
bank = MyBank;
I get the error message 'undefined function or variabel 'MyBank'? Not sure what I'm missing as the examples I have seen appear to do the same thing?
Also when typing BA in my constructor should there be any intellisense? Find it quite painful coding in Matlab.
Matlab doesn't understand ".
You shuold use BA.CustName = 'Mr Blogs'
Are you using Matlab or Octave? Octave understands ", but last time I checked classdef is not working.
To find the constructor with "intellisense", you should type "My" and then press tab. At least for me this works.
If this doesn't work for you, check that your file is named MyBank.m and double check if it is in your current working folder. Open the file in your edior window and execute it by pressing F5. Then a dialog should pop up, if your in another working directory.
Could someone please assist:
Is there a way to change font size of classregtree in matlab?
How can I change the class labels?
Well, try this:
using an example from the docs:
load fisheriris;
t = classregtree(meas,species,...
'names',{'SL' 'SW' 'PL' 'PW'})
I was able to get the property-inspector:
tr=view(t)
inspect(tr)
..what didnt help a lot...
Now I took the handles of all children of tr, that are text-elements:
allHandles=findall(tr,'Type','text')
Next, I just changed the FontSize:
set(allHandles,'FontSize',16)
and there you go :) it is working!
To see and edit other properties, you could now use the inspect-method, as I was doing at my first try, but with the text-handles of course. normally, there should be all other properties available as for normal text-elements. Just check the docs for uicontrol + text.
Lucius's answer worked for me but instead of
tr=view(t)
I had to run this:
before = findall(groot,'Type','figure'); % Find all figures
view(t,'Mode','graph')
after = findall(groot,'Type','figure');
tr = setdiff(after,before); % Get the figure handle of the tree viewer
inspect(tr)
I'm reading DICOM series using itk and converting them into VTK for visualization purposes. Even though I manage to visualize DICOM series in 3 different windows with 3 different orientations (XY, XZ and YZ) I can't even click on the windows. When I click or try to change the slice viewed, my code gives an access violation error. I'm using ImageViewer2 to visualize the slices. A file called itkVTKImageExportBase.cxx is opened when I try to find out what the error is. The lines referred to are:
void VTKImageExportBase::UpdateInformationCallbackFunction(void* userData)
{
static_cast<VTKImageExportBase*>
(userData)->UpdateInformationCallback();
}
My code is as follows:
typedef itk::VTKImageExport< ImageType > ExportFilterType;
ExportFilterType::Pointer itkExporter = ExportFilterType::New();
itkExporter->SetInput( reader->GetOutput() );
// Create the vtkImageImport and connect it to the itk::VTKImageExport instance.
vtkImageImport* vtkImporter = vtkImageImport::New();
ConnectPipelines(itkExporter, vtkImporter);
pViewerXY->SetInput(vtkImporter->GetOutput());
pViewerXY->SetSlice(3);
pViewerXY->SetSliceOrientationToXY();
pViewerXY->SetupInteractor(m_pVTKWindow_1);
pViewerXY->UpdateDisplayExtent();
m_pVTKWindow_1->AddObserver(vtkCommand::KeyPressEvent, m_pVTKWindow_1_CallbackCommand);
m_pVTKWindow_1->Update();
pViewerXZ->SetInput (vtkImporter->GetOutput());
pViewerXZ->SetSliceOrientationToXZ();
pViewerXZ->SetupInteractor(m_pVTKWindow_2);
pViewerXZ->UpdateDisplayExtent();
m_pVTKWindow_2->AddObserver(vtkCommand::KeyPressEvent, m_pVTKWindow_2_CallbackCommand);
m_pVTKWindow_2->Update();
pViewerYZ->SetInput (vtkImporter->GetOutput());
pViewerYZ->SetSliceOrientationToYZ();
pViewerYZ->SetupInteractor(m_pVTKWindow_3);
pViewerYZ->UpdateDisplayExtent();
m_pVTKWindow_3->AddObserver(vtkCommand::KeyPressEvent, m_pVTKWindow_3_CallbackCommand);
m_pVTKWindow_3->Update();
pViewerXX windows are imageviewer2 objects whereas m_pVTKWindow_X refers to wxVTK objects to use in wxWidgets GUI package.
Optional: My exporter and importer are as given below:
template <typename ITK_Exporter, typename VTK_Importer>
void ConnectPipelines(ITK_Exporter exporter, VTK_Importer* importer)
{
importer->SetUpdateInformationCallback(exporter->GetUpdateInformationCallback());
importer->SetPipelineModifiedCallback(exporter->GetPipelineModifiedCallback());
importer->SetWholeExtentCallback(exporter->GetWholeExtentCallback());
importer->SetSpacingCallback(exporter->GetSpacingCallback());
importer->SetOriginCallback(exporter->GetOriginCallback());
importer->SetScalarTypeCallback(exporter->GetScalarTypeCallback());
importer->SetNumberOfComponentsCallback(exporter->GetNumberOfComponentsCallback());
importer->SetPropagateUpdateExtentCallback(exporter->GetPropagateUpdateExtentCallback());
importer->SetUpdateDataCallback(exporter->GetUpdateDataCallback());
importer->SetDataExtentCallback(exporter->GetDataExtentCallback());
importer->SetBufferPointerCallback(exporter->GetBufferPointerCallback());
importer->SetCallbackUserData(exporter->GetCallbackUserData());
}
/**
* This function will connect the given vtkImageExport filter to
* the given itk::VTKImageImport filter.
*/
template <typename VTK_Exporter, typename ITK_Importer>
void ConnectPipelines(VTK_Exporter* exporter, ITK_Importer importer)
{
importer->SetUpdateInformationCallback(exporter->GetUpdateInformationCallback());
importer->SetPipelineModifiedCallback(exporter->GetPipelineModifiedCallback());
importer->SetWholeExtentCallback(exporter->GetWholeExtentCallback());
importer->SetSpacingCallback(exporter->GetSpacingCallback());
importer->SetOriginCallback(exporter->GetOriginCallback());
importer->SetScalarTypeCallback(exporter->GetScalarTypeCallback());
importer->SetNumberOfComponentsCallback(exporter->GetNumberOfComponentsCallback());
importer->SetPropagateUpdateExtentCallback(exporter->GetPropagateUpdateExtentCallback());
importer->SetUpdateDataCallback(exporter->GetUpdateDataCallback());
importer->SetDataExtentCallback(exporter->GetDataExtentCallback());
importer->SetBufferPointerCallback(exporter->GetBufferPointerCallback());
importer->SetCallbackUserData(exporter->GetCallbackUserData());
}
I don't have an exact answer to your question, but have you considered using one of the common medical image processing frameworks? There are a couple of them like MITK (mitk.org) or Slicer3D (slicer.org). They do a great job of linking together ITK, VTK and a sophisticated GUI Framework like QT (in the MITK case).
I have worked a long time in medical image processing and used MITK extensively. In my opinion, using a medical image processing framework really helps you focus on your real image processing problems, rather than trying to build processing/visualization pipelines for different types of visualizations.
If you look at InsightApplications, there are two methods:
The same as you tried, which is here, or
This one, which creates a pipeline object that can be connected on both sides. We're actually using this, and it works out quite well for us. You can copy this class into your code and use it.
There are some interesting usage examples in there too. Take a look at them and see if you can modify anything for your requirement.
Classes in the ITKVTkGlue module can be used to convert an ITK image to in a pipeline. See the tests for examples of how the classes are applied.