I'm using MATLAB and I want a bar plot.
I plotted the bars, and then give titles to the bars.
If I only using 10 bars it works (see pic1).
But often I need more, mostly 32 bars (see pic2).
In this case the titles are not under the bars. I found out that MATLAB don't overlap the titles. The max value is 15 bars.
Does anyone knows how I can get MATLAB to overlap the titles?
Here is my code for plotting the bars:
y = absSlopes(1, 1:size(absSlopes,2));
hb = bar(y);
set(gca,'XTickLabel',titles);
rotateXLabels(gca, 45);
ylabel('Anzahl');
absSlopes is a matrix and I use the complete first line.
You may want to try XTick in addition to XTickLabel. At least for regular plots you can enforce specific spacings through this setting.
You can do this by an additional setup-command:
set(gca,'XTickLabel',titles);
set(gca,'XTick',absSlopes(1,:));
Of course, you can set both properties in the same line, but I like to keep it simple in case you want to deactiviate/comment one or the other setting later on.
Related
I am generating multiple plots of different datasets in succession using MATLAB. I would like the legend positions to be such that they don't overlap on the plotted lines and it would be ideal if this placement could be done automatically.
I am aware of setting the 'Location' to 'best' to achieve this but the placement of the legend tends to be awkward when 'best' is used (below). Also, I would like the legend to be inside the plot. I also came across a way to make the legend transparent (here) so that it does not render the plotted data invisible, but explicitly placing the legend elsewhere is what I am looking for.
Is there a way to place the legend at the extremes of the image ('NorthWest', 'SouthWest' etc) automatically such that it does not overlap on the plotted data (apart from the methods suggested above)?
So, you have tried using Location instead of Position? For example:
x =1:100;
y = x.^2;
lgd = legend('y = x.^2');
set(lgd,'Location','best')
and you are getting odd results correct? A quick way of solving this would be to still use Location, with best, and extract the coordinates:
lgd.Position
You should get something like this:
ans =
0.7734 0.3037 0.1082 0.0200
which maps to:
[left bottom width height]
You will need to focus on left and bottom. These two values, left and bottom, specify the distance from the lower left corner of the figure to the lower left corner of the legend, and they are analogous to the grid frame you are using.
Then, depending on the size of the frame (I would suggest you use axis([XMIN XMAX YMIN YMAX]) for this, if possible), you can pinpoint the position of the legend within the grid. What you can do next, is check if and which of your graphs in the plot cross paths with the legend (maybe define a relative distance function based on some distance threshold) and if they do, then randomly reposition the legend (i.e. change the values of left and bottom) and repeat until your conditions are met.
If this still troubles you I can write a short snippet. Finally, know that you can always opt for placing the legend on the outside:
set(lgd,'Location','BestOutside')
i want to plot different errorbars std_a/b/c in my bar graph
a=5; std_a=0.9;
b=6; std_b=0.5;
c=7; std_c=0.2;
%plot
bar([a,b,c]);
errorbar([a,b,c],[std_a,std_b,std_c]);
somehow this is not working. how can get for each bar the correct errorbar?
You're close. errorbar by default plots a line and adds errorbars to it, and if you haven't called hold on or hold all it will overwrite what you already have. If you just want the error bars and not lines between them, give it a plot format that only plots points, like r.:
bar([a,b,c]);
hold on
errorbar([a,b,c],[std_a,std_b,std_c],'r.');
I had to improve location of the error bars on x axis because for more than one data series the bars appear side by side, while the error bars may appear one on top of the other.
for data with two columns and serr (standard error in my case) of the same size I used a shift to the left and right of +-1.4 (see gap in the code below).
gap=0.14;
X=1:length(data);
X=[X'-gap,X'+gap];
errorbar(X,data,serr,'k.');
you can specify a third input argument of zeros the same size of serr, if you want to minimise the bottom bars so that only top error bars show.
I have created a graph with data from an Excel file. I need to keep all the xticks but the xticklabels to appear just on every 6 ticks. I have tried doing this:
tickStep=6;
Sheet=2;
filename='MyData.xlsx';
[~,xAxis]=xlsread(filename,Sheet,'A2:A60');
yAxis=xlsread(filename,Sheet,'B2:B60');
plot(1:numel(xAxis),yAxis)
set(gca,'xtick',1:numel(xAxis))
set(gca,'xticklabel',xAxis(1:tickStep:numel(xAxis)))
Unfortunately it does not work as all the xticks are plotted, but the xticklabels appear upon each xtick instead of every 6th like I was trying to achieve. I have spent quite a long time thinking about the solution:-(. I need help. Thanks.
edit: I've included an image to help answer questions below:
In relation to this post, would it also be possible that the xticks appear every 4 xticks instead of keeping all of them, at the same time that the xticklabels are plotted every 6 xticks?, not sure about this.
You still need to enter an empty string (or empty cell) for the ticks that will have no label. You can do this by replacing the last line with these three lines:
xTickLabels = cell(1,numel(xAxis)); % Empty cell array the same length as xAxis
xTickLabels(1:tickStep:numel(xAxis)) = xAxis(1:tickStep:numel(xAxis));
% Fills in only the values you want
set(gca,'XTickLabel',xTickLabels); % Update the tick labels
Edit in response to questions below...
The reason your labels appear to be offset from the ticks is because the bottom of the letters appears to be getting lined up with the tick mark. I'm guessing you want the text justified such that the center of each letter lines up with the tick mark. There's no way to do this with the standard MATLAB axes, but there are some submissions on the MathWorks File Exchange that convert the tick labels to text objects and thus give you more options for customizing the text properties:
XTICKLABEL_ROTATE by Brian Katz
Format Tick Labels by Alexander Hayes
Once you convert the labels to text objects, you can then adjust the rotation or vertical justification by modifying the 'Rotation' and 'VerticalAlignment' properties, respectively.
The MATLAB surf plot below is essentially two plots plotted adjacent to each other. For clarity, I have included some code below used to prepare the plot:
band1 = horzcat(band1, eSurface2(:,:,1));
band2 = horzcat(band2, eSurface2(:,:,2));
surf(band2,'DisplayName','band2');
surf(band3,'DisplayName','band2');
I would like for the y axis numbering to restart at the start of the second graph. How do I go about doing that?
You can use the 'YTick' and 'YTickLabel' properties of the axis to control the ticks, this way you can make it start from zero for the second graph. It will require some trail and error to get it right. See the relevant doc here (you'll have to scroll all the way to the bottom of the page).
Take advantage of the following feature of 'YTickLabel': "If you do not specify enough text labels for all the tick marks, MATLAB uses all of the labels specified, then reuses the specified labels".
If I zoom several time graph all labels from axis X disapear (go away) and there are no visible axis X labels so it is not possible to understand the part of graph where am I.
How can I force matlab to always display labels on axis X and to update them automatically while zooming and to display enough digits so "neighboor" labels must be different.
it depends, are you manually setting the tick marks yourself ('XTick' and 'XTickLabel' axis properties)?
Try this simple example
plot(sin(1:10), 'o-')
without changing anything, you can zoom as much as you want, and the tick labels will always be visible
EDIT
The root cause of the problem is the same as the one raised in your other question, datetick function will manually set the tick labels, thus disabling automatic update on zoom/pan.
The good news is there are already submissions on FEX that tries to solve this exact problem with DATETICK
I run into the same problem even on the new version of MATLAB (r2014). MATLAB does not display sufficient x-axis tick labels as you zoom-in. After several experiments I found the following workaround. Following is a plot before implementing the solution. MATLAB displays only three XTick labels on the x-axis even though there is sufficient space for more (there are often even less labels as you zoom in more).
Suspecting that MATLAB thinks that it does not have sufficient space to display more labels, a workaround can be to rotate the labels. To do that, after you issue the plot commands, e.g.
plot(tsX);
hold on;
plot(tsY);
plot(tsZ);
add the following command
set(gca,'XTickLabelRotation',90);
Now MATLAB plots with more labels
I am going to report this as a bug to the MATLAB guys.