Chris Portal

Last seen: 5 days ago

MathWorks

62 total contributions since 2016

MATLAB user since 1992
MathWorks employee since 1997

In my early years at MathWorks, I was a developer on the Data Acquisition Toolbox and Instrument Control Toolbox, before leading the development of Image Acquisition Toolbox v1.0.

These days, I focus on managing the MATLAB Graphics & App Building area, having worked on the MATLAB graphics R2014b update and the R2016a App Designer launch.

Outside of work - in my oodles of free time - I dabble in some filmmaking and photography projects. And while this is meant to be a creative break from work, every 5 years it seems both worlds intersect (www.chrisportal.com/portfolio-items/call-me-nerdy/).

See you around the community. Oh, and obviously, any advice or opinions posted here are my own, and in no way reflect that of MathWorks.

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Answered
App Slow With UIAxes
Thank you @Adam Danz and @Ephraim Bryski. The additional info is useful. I see the same uifigure/uiaxes slowness Adam is showing...

9 months ago | 4

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Answered
How to install GUIDE to App Designer migration tool?
You would need to download it from here: <https://www.mathworks.com/matlabcentral/fileexchange/66087-guide-to-app-designer-mi...

2 years ago | 0

Answered
Using animatedline in Matlab App Designer?
Your callback is doing a “clear all”, which clears out all of the variables available at that point, which in this case are “app...

2 years ago | 0

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Answered
Problem with auto reflow in app designer
Auto-reflow is different than the autoresize option. Autoresize will resize components for you when the window is resized. Reflo...

2 years ago | 0

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How do display the contents of array in Listbox using app designer ???
See the documentation for an example: https://www.mathworks.com/help/matlab/ref/uilistbox.html#bujty2f-1 Basically, you config...

2 years ago | 0

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Why can I not plot in app designer?
The data doesn’t fit within your limits. By only specifying the A vector you mentioned, you are only specifying the Y axes value...

2 years ago | 1

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Is it possible to run an App Designer app on an installation of Matlab which does not have App Designer?
App Designer apps do not depend on App Designer to run, but the apps use features that were first introduced in R2016a, which is...

2 years ago | 0

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Answered
Trying to learn how to display an image using app designer
You can pass workspace variables to your app using a startup function and app input arguments. The approach is described here: ...

2 years ago | 0

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Answered
Matlab app designer, overlaying images with transparency in UIAxes?
Using R2018a, I'm not able to reproduce this. This is the code I tried: I = imread('cameraman.tif'); f1 = imshow(I,'Pare...

2 years ago | 1

Answered
How do I save data from a Web App into a local file ?
In R2018a, this would only be possible if you specify a network path to the WRITETABLE command for it to produce the file at tha...

2 years ago | 1

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Dynamic Option Values in UIDropdown using App Designer
You can do this by configuring your dropdown's values in the startup callback function. Right click on the figure background in ...

2 years ago | 1

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How to speed up UIAxes in App Designer
Hard to say for sure without seeing the surrounding code, but you may need a call to DRAWNOW in your for loop. Alternatively...

2 years ago | 0

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Answered
Pairing MLAPP (AppDesigner) Apps With Other Classes
This is how I’d approach it: # Use the app window’s StartupFcn callback to initialize all your Class1, Class2, and Class3 obj...

3 years ago | 0

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How do I make an App written in App Designer Modal?
If you're using 18a or later, you can try using UIPROGRESSDLG to create an indeterminate progress bar while the secondary app is...

3 years ago | 2

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Access public property outside the app
You can take a look at this File Exchange submission to see how to do this in 16a and 16b releases of App Designer: <https://...

3 years ago | 1

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Answered
Creating Multiwindow Apps in MATLAB 2016b
You can take a look at this File Exchange submission which does something similar and should work for 16a and 16b releases of Ap...

3 years ago | 0

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Answered
Can Web Apps take input arguments?
Currently, it’s a limitation, but there’s a workaround. This is what the doc says: <https://www.mathworks.com/help/compiler/w...

3 years ago | 0

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Answered
App designer dynamic properties
The answer in this other post describes how to do this in the general case if you’re creating multiple new components. If you ar...

3 years ago | 0

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Introduction of a new class properties inside its functions in App Designer.
The way to do this would be to add a property to your app called something like “NewComponents”. Every time you need to intro...

3 years ago | 0

Answered
How to plot a 3D graphic with app designer ?
You can do this by calling your 3D plotting function and passing in the handle to your app axes: [X,Y] = meshgrid(1:0.5:10,...

3 years ago | 1

Answered
How to pause/stop a Simulink model directly from App designer
You can do this by using the set_param and get_param functions to configure the SimulationCommand setting for your model. This d...

3 years ago | 0

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Answered
How to Set App Designer Drop Down and List Box Data types
See the answer thread for the following post on how to address this: <https://www.mathworks.com/matlabcentral/answers/400550-...

3 years ago | 0

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Answered
App Designer LIST BOX data type
The type for the Value property depends on how you've configured the listbox. There are basically 2 scenarios: # *Using Items...

3 years ago | 0

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Is it possible to Re-order App Properties
Unfortunately there is no way to do this as of R2018a. It is a known enhancement, but I will log an additional request for the t...

3 years ago | 0

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Answered
Add static images with APP designer
There are currently 2 options available which are described here: https://www.mathworks.com/matlabcentral/answers/283215-ins...

3 years ago | 0

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Uidatepicker in app designer
You can pass the panel’s handle as the parent for the uidatepicker. The syntax is described here: <https://www.mathworks.com/...

3 years ago | 0

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Trisurf in App Designer
TRISURF doesn't appear to support an axes to be passed in as the first input argument. Instead, it can take it via PV pairs as f...

3 years ago | 1

Answered
How can I open an external application from Matlab app designer
Your system is not going to know where your test data file lives, so you need to provide it more than just the name and extensio...

3 years ago | 0

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Answered
Problems with BytesAvailableFcn in App designer
This was covered in a related post available here: <https://www.mathworks.com/matlabcentral/answers/276824-how-to-use-bytesav...

3 years ago | 1

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Answered
2017b: Since install of 2017b, I cannot run App designer properly. It fails to load something and does not compile.
Can you try the following and see if that helps: rehash toolboxcache

3 years ago | 0