Environment
You can increment, decrement, multiply, or divide numeric values in the Editor and then run the current section after every change. This workflow can help you fine-tune and experiment with your code.
To adjust a numeric value, select the value or place your cursor next to the value. Next, right-click and select Increment Value and Run Section. In the dialog box that appears, specify a step value for addition and subtraction or a scale value for multiplication and division. Then, click one of the operator buttons to add to, subtract from, multiply, or divide the selected value in your section. MATLAB runs the section after every click.
You can add a file browser to your live script to interactively select a file by
opening a file selection dialog box. To add a file browser, go to the Live
Editor tab, and in the Code section, click
Control. Then, select File
Browser.
For more information, see Add Interactive Controls to a Live Script.
The Live Editor automatically left-aligns drop-down lists, edit fields, numeric sliders, and numeric spinners within a block of code when the code is hidden.
For example, this live script contains three controls in two different blocks of code. When the code is visible, the controls appear inline with the code.
When the code is hidden, the Live Editor automatically aligns the second and third controls, as they are in the same block of code. The first control is not in the same block of code and is therefore not aligned to the other two controls.
The Live Editor does not align check boxes, buttons, and file browsers.
The MATLAB Online™ desktop includes sidebars on either side of the desktop to access desktop tools and change the desktop layout. The sidebars show the tools, such as the Workspace panel and the Files panel, that are docked on either side of the desktop. If there are no tools docked on one side, the sidebar for that side is hidden. You can use the sidebars to show and hide tools, group them together, and move them from one location to another.
When a tool is docked on the left or right side of the desktop, the sidebar on that side displays an icon for the tool. To show or hide the tool, click its icon in the sidebar. To show and hide multiple tools together, group them by dragging one of the tool icons next to another tool icon. To move a tool to a different location on the desktop, drag the tool or the icon for the tool to the new location. If there are no tools docked on one side, then the sidebar on that side is hidden.
You can use the Code Issues tool to view error and warning messages about your code. The Code Issues tool displays the coding problems found by the MATLAB Code Analyzer as it automatically checks your code. Using the Code Issues tool, you can choose to view the errors and warnings for the current file or for all open files. You also can filter the list of messages by type (error or warning) as well as by message text.
To open the Code Issues tool, go to the Editor or Live
Editor tab, and in the Analyze section, click
Code Issues. By default, the Code Issues tool opens on the right
side of the desktop. To hide the Code Issues tool, click the Code Issues
icon in the sidebar.
You can use the improved Find Files tool to search for files based on name or content.
When searching, you can choose whether to match the case of your search text as well as
whether to match the whole word. You also can select what folder to search in and filter
results by file extension. To search for files, click the Find Files icon
in the sidebar on the left side of the MATLAB
Online desktop.
Language and Programming
Fix certain code issues directly from the Code Analyzer app using the Fix button.
Data Analysis
Data Import and Export
Mathematics
Graphics
Use the sky
function to color charts with the same monochromatic colormap that heatmap charts use.
Like for all predefined colormaps, you can optionally specify the number of colors for
the sky colormap.
Create horizontal or vertical layouts by specifying "horizontal" or
"vertical" as the first input argument to the tiledlayout function. For example, create a horizontal layout and add
three plots.
tiledlayout("horizontal")
x = 1:5;
nexttile
plot(x)
nexttile
bar(x);
nexttile
contourf(peaks)
Change the thickness of grid lines independently of the box outline and tick marks by
setting the GridLineWidth and MinorGridLineWidth properties of the axes. Before R2023a, the
LineWidth property of the axes was the only property for
controlling the grid line width. However, that property controlled the grid lines, box
outline, and tick marks together. Now you can control the thickness of the grid lines
separately.
When you change the Rotation property of
an axis label in a 2-D plot, the HorizontalAlignment and
VerticalAlignment properties of the label automatically change
to prevent overlap between the label and the axes.
For example, create a plot with a y-axis label.
plot([0 3 1 6 4 10])
ylab = ylabel("Y Data");
Rotate the label so that the text is horizontal. MATLAB automatically adjusts the HorizontalAlignment and
VerticalAlignment properties to prevent the overlap.
ylab.Rotation = 0;
When plotting a series of multiple lines, you can use the LineStyleCyclingMethod property of the axes to control how different
lines are distinguished from one another. Specify this property as one of these values:
"withcolor"— Cycle through the line styles with the colors"beforecolor"— Cycle through the line styles before cycling through the colors"aftercolor"— Cycle through the line styles after cycling through the colors (default)
Specify whether a specific line affects the automatically selected axes limits by
setting the AffectAutoLimits property. By default, the axes limits change to
encompass the data range for each successive line you create. Setting this property
enables you to focus on the range of a subset of lines in the axes.
![Two line plots, each showing the same two data sets as a thin red line and thick blue line, but with different x-axis limits. The x-values of the thin red line range from –100 to 100. The x-values of the thick blue line range from 0 to 100. The x-axis in the left plot spans the range [–100, 100]. The x-axis in the right plot spans the range [0, 100]. As a result, the right plot excludes part of the thin red line.](23a-graphics-affectsaoutolims-for-gr.png)
In MATLAB
Online, you can set the default values for these aspects of images displayed
using imshow:
Axes visible — Control whether
imshowdisplays images with the axes box outline and tick labels.Border Style — Control whether
imshowdraws a tight or loose border around images in the figure window.Initial Magnification — Control whether
imshowinitially fits images to the figure window or magnifies them by a specified percentage.
To open these image display preferences, on the Home
tab, in the Environment section, click 
Preferences. Select MATLAB > Image Display.
App Building
When you load an app in App Designer, a progress bar now displays an estimate of its loading progress.
To add a label to a UI component without one, in Design View, right-click the component and select Add Label or use the keyboard shortcut Ctrl+L.
You can now more efficiently create a new callback for a UI component that already has
a callback assigned. To replace an existing callback with a new one, select the
component in the Component Browser and, in the
Callbacks tab, select the option to add a callback. For
example, for a component with a ButtonPushedFcn callback already
assigned, select <add ButtonPushedFcn callback> from the
associated drop-down list. App Designer creates a new callback function, assigns it to
the component, and unassigns the previous callback function.
Previously, you had to first unassign the assigned callback from the component before creating a new callback.
For apps created in App Designer and using the uifigure function,
use data cursor mode to interactively create and edit data tips. For supported charts,
select the Data Tips 
icon in the axes toolbar or use the datacursormode function.
Performance
The ruler-pan interaction is faster and smoother within apps and within figures
created with the uifigure function in R2023a than in R2022b. The
improvement is most noticeable for plots that display a large number of data
points.
For example, this code creates a figure with a plot of a 2500-by-2500 matrix. When you pan the ruler, the ruler-pan interaction is smoother and the axes track your mouse motion more closely in R2023a than in the previous release.
f = uifigure; ax = uiaxes(f); p = peaks(2500); plot(ax,p)
| R2022b | R2023a |
|---|---|
When panning the ruler, the surface plot takes a moment to reposition and jumps to the new location.
| When panning the ruler, the surface plot follows the mouse motion more closely and repositions more quickly at the new location.
|
The ruler-pan interaction was performed on a Windows 10, Intel Xeon CPU E5-1650 v4 @ 3.60 GHz test system by running the above script and panning the y-axis ruler.
In the output of the Live Editor, the performance of filtering a numeric table or timetable variable is improved. When dragging the maximum or minimum value slider, the drag interaction is smoother and faster in R2023a than in R2022b, and the data tip displaying the current slider value appears to the side of the filtering figure.
For example, for a table output in the Live Editor, pause on the header of a numeric variable and click the triangle icon. Then, to filter the data, adjust the maximum value by dragging the slider. The drag interaction is smoother and tracks your mouse motion more closely in R2023a than in the previous release.
| R2022b | R2023a |
|---|---|
After dragging the maximum value slider in a filtering figure, the slider takes a moment to reposition and jumps to the new location. The associated data tip moves with the slider and obscures the filtering figure.
| After dragging the maximum value slider in a filtering figure, the slider follows the mouse motion more closely and repositions more quickly at the new location. The associated data tip is located in a fixed position to the right of the filtering figure.
|
The filtering interaction was performed on a Windows 10, Intel Xeon CPU E5-1650 v4 @ 3.60 GHz test system by dragging the maximum value slider in the filtering figure for a 1000-row numeric table variable.
When a user resizes an app figure window, some apps reposition their content faster in R2023a than in R2022b. The types of apps that show this improvement are:
Large apps with tabs that have an
AutoResizeChildrenvalue of'on'Large apps with panels and button groups that have a
SizeChangedFcncallback
For example, this code creates an app with a tab group where each tab contains many edit fields that are resized automatically. The resize operation is smoother and faster in R2023a than in the previous release.
function tabResize fig = uifigure; tg = uitabgroup(fig,"Position",[20 20 400 375]); for k1 = 1:5 t = uitab(tg,"Scrollable","on"); for k2 = 1:100 ef = uieditfield(t,"Position",[50 22*k2 250 20]); end end end
| R2022b | R2023a |
|---|---|
When the app resizes, the app content takes multiple seconds to reposition. | When the app resizes, the app content takes less than one second to reposition. |
As another example, this code creates an app with many panels, each of which resizes a
button using a SizeChangedFcn callback whenever the app size changes.
The resize operation is smoother and faster in R2023a than in the previous
release.
function panelResize fig = uifigure("AutoResizeChildren","off", ... "SizeChangedFcn",@resizePanels); for k = 1:225 p = uipanel(fig, ... "AutoResizeChildren","off", ... "SizeChangedFcn",@resizeButtons); btn = uibutton(p,"Position",[2 2 20 20]); end end function resizeButtons(src,~) for k = 1:length(src.Children) src.Children(k).Position(3:4) = 0.9*src.Position(3:4); end end function resizePanels(src,~) xscale = src.Position(3)/15; yscale = src.Position(4)/15; for k = 1:length(src.Children) p = src.Children(k); p.Position = [xscale*(mod((k-1),15)), ... yscale*(floor((k-1)/15)), ... xscale, ... yscale]; end end
| R2022b | R2023a |
|---|---|
When the app resizes, the app content takes multiple seconds to reposition.
| When the app resizes, the app content takes about one second to reposition.
|
The resize interactions were performed on a Windows 10, Intel
Xeon CPU E5-1650 v4 @ 3.60 GHz test system by running the
tabResize and panelResize functions and
resizing the figure window.
Software Development Tools
You can now investigate how projects in your hierarchy relate to each other and identify projects that introduce circular dependencies using the Project Hierarchy view in MATLAB Online. For more information, see Analyze Project Dependencies.
