I am plotting on a very small scale from a loop that generates a vector, data. Anyway, the YTickLabel is automatically in "6x10-3" format, for example.
data = [0.0004578945622489441 0.00154798436685536652442 0.005987463212456878422336324 0.003651558742652333624455];
plot(data)
I know I can use the following to have the full tick label displayed:
yt = get(gca,'YTick');
set(gca,'YTickLabel', sprintf('%.4f|',yt))
However, because these numbers are generated from my loop, they are very long (~20 digits) and so this displays them in full. I need to somehow round my ticks? (Without doing it manually using YTickLabel = {'0.0001', '0.0002'}; ... etc.)
The following works for me:
set(gca, 'YTickLabel', get(gca, 'YTick'))
In Matlab R2014b you could also use
ax = gca;
ax.YTickLabel = ax.YTick;
Either way, what this does is assign the YTick values to the YTickLabel. Somehow that prevents scientific notation.
Related
Tick labels for ticks bigger than about 10'000, get formatted to 1x10^4 for example. Whereas the exponential part appears above the corresponding axes. This misbehavior has been well described on on matlab central as well, but without a solution.
Thanks for your help.
The 'quick trick'
set(gca, 'YTickLabel',get(gca,'YTick'))
did not work when applied to bar3, as can be seen on the following figure.
EDIT
According to this technical solution page, the recommended way of formatting the tick labels is this (you can use any of the number formatting functions like NUM2STR, SPRINTF, MAT2STR, or any other..)
y = cool(7);
bar(y(:,1)*1e6)
set(gca, 'YTickMode','manual')
set(gca, 'YTickLabel',num2str(get(gca,'YTick')'))
However there seems to be a bug when it comes to the Z-axis (the labels are correctly formatted, but the exponential multiplier is still showing for some reason!)
y = cool(7);
bar3(y*1e6, 'detached')
set(gca, 'ZTickMode','manual')
set(gca, 'ZTickLabel',num2str(get(gca,'ZTick')'))
Finally, there's another workaround where we replace the tick labels with text objects (see this technical solution page as reference):
y = cool(7);
bar3(y*1e6, 'detached')
offset = 0.25; Xl=get(gca,'XLim'); Yl=get(gca,'YLim'); Zt=get(gca,'ZTick');
t = text(Xl(ones(size(Zt))),Yl(ones(size(Zt)))-offset,Zt, num2str(Zt')); %#'
set(t, 'HorizontalAlignment','right', 'VerticalAlignment','Middle')
set(gca, 'ZTickLabel','')
One other trick you can try is to scale your data before you plot it, then scale the tick labels to make it appear that it is plotted on a different scale. You can use the function LOG10 to help you automatically compute an appropriate scale factor based on your plotted values. Assuming you have your data in variables x and y, you can try this:
scale = 10^floor(log10(max(y))); %# Compute a scaling factor
plot(x,y./scale); %# Plot the scaled data
yTicks = get(gca,'YTick'); %# Get the current tick values
set(gca,'YTickLabel',num2str(scale.*yTicks(:),'%.2f')); %# Change the labels
One way to get better control over tick labels, and to avoid the exponential formatting, is to use TICK2TEXT from the File Exchange.
Here's an example:
y = cool(7); %# define some data
ah = axes; %# create new axes and remember handle
bar3(ah,y*1E6,'detached'); %# create a 3D bar plot
tick2text(ah, 'ztickoffset' ,-1.15,'zformat', '%5.0f', 'axis','z') %# fix the tick labels
I have a semilogarithmic plot which works so far with semilogx. Now I would like to change the tick labels. Now it says 10^8 10^9 ... 10^13, but I would like to see 1e8, 1e9, ... 1e13 on the x-axis. How can I change that?
Cheers
Manuel
You can change the XTickLabels property using your own format:
set(gca,'XTickLabels',sprintfc('1e%i',0:numel(xt)-1))
where sprintfc is an undocumented function creating cell arrays filled with custom strings and xt is the XTick you have fetched from the current axis in order to know how many of them there are.
Example with dummy data:
clear
clc
close all
x = 0:100000;
y = log(x);
figure
semilogx(x,y)
xt = get(gca,'XTick');
set(gca,'XTickLabels',sprintfc('1e%i',0:numel(xt)-1))
Output:
I am trying to bold the right side y axis for a Pareto plot in Matlab, but I can not get it to work. Does anyone have any suggestions? When I try to change the second dimension of ax, I get an error:
"Index exceeds matrix dimensions.
Error in pcaCluster (line 66)
set(ax(2),'Linewidth',2.0);"
figure()
ax=gca();
h1=pareto(ax,explained,X);
xlabel('Principal Component','fontweight','b','fontsize',20)
ylabel('Variance Explained (%)','fontweight','b','fontsize',20)
set(ax(1),'Linewidth',2.0);
set(ax(1),'fontsize',18,'fontweight','b');
%set(ax(2),'Linewidth',2.0);
%set(ax(2),'fontsize',18,'fontweight','b');
set(h1,'LineWidth',2)
Actually you need to add an output argument during the call to pareto and you will then get 2 handles (the line and the bar series) as well as 2 axes. You want to get the YTickLabel property of the 2nd axes obtained. So I suspect that in your call to pareto above you do not need to supply the ax argument.
Example:
[handlesPareto, axesPareto] = pareto(explained,X);
Now if you use this command:
RightYLabels = get(axesPareto(2),'YTickLabel')
you get the following (or something similar):
RightYLabels =
'0%'
'14%'
'29%'
'43%'
'58%'
'72%'
'87%'
'100%'
What you can do is actually to erase them altogether and replace them with text annotations, which you can customize as you like. See here for a nice demonstration.
Applied to your problem (with dummy values from the function docs), here is what you can do:
clear
clc
close all
y = [90,75,30,60,5,40,40,5];
figure
[hPareto, axesPareto] = pareto(y);
%// Get the poisition of YTicks and the YTickLabels of the right y-axis.
yticks = get(axesPareto(2),'YTick')
RightYLabels = cellstr(get(axesPareto(2),'YTickLabel'))
%// You need the xlim, i.e. the x limits of the axes. YTicklabels are displayed at the end of the axis.
xl = xlim;
%// Remove current YTickLabels to replace them.
set(axesPareto(2),'YTickLabel',[])
%// Add new labels, in bold font.
for k = 1:numel(RightYLabels)
BoldLabels(k) = text(xl(2)+.1,yticks(k),RightYLabels(k),'FontWeight','bold','FontSize',18);
end
xlabel('Principal Component','fontweight','b','fontsize',20)
ylabel('Variance Explained (%)','fontweight','b','fontsize',20)
which gives this:
You can of course customize everything you want like this.
That is because ax is a handle to the (first/left) axes object. It is a single value and with ax(1) you got lucky, its ax again, but ax(2) is simply not valid.
I suggest to read the docs about how to get the second axis. Another good idea always is to open the plot in the plot browser, click whatever object you want so it is selected and then get its handle by typing gco (get current object) in the command window. You can then use it with set(gco, ...).
I am having difficulties on plotting time on the xaxis. I have some overlapping labels. See below:
This is my code:
time=datenum(0,0,0,0,0,timeinseconds);
labs=1:10:length(time);
figure(3);
plotyy(time,xvalue,time,dens);
datetick('x','HH:MM');
set(gca,'XTick',time(labs),'XTickLabel',time(labs));
legend('xval','CDF');
title('Crash on Oct.10 2008 at 15:59pm');
xlabel('Time');
First, why are the labels overlapping with the old ones? And secondly, how I can get the label to rotate 90degrees? I tried some other matlab functions to turn the labels but none seem able to tackle time format labels.
Calling plotyy you create two axis objects. Your overlap problem does probably come from the fact that you modify only one set of those axis, while leaving the other as it was originally set up.
One option is handling both of the created axis when you call plotyy by:
[AX, H1, H2] = plotyy( time, xvalue, time, dens);
Your first option here is setting up both of the axis, contained within the array of handlers AX, via changing the'XTick' propriety as:
set( AX(1), 'XTick', time(labs), 'XTickLabel', time(labs));
set( AX(2), 'XTick', time(labs), 'XTickLabel', time(labs));
But you also have the option of leaving the labels for the second axis empty, replacing the second line above:
set( AX(1), 'XTick', time(labs), 'XTickLabel', time(labs));
set( AX(2), 'XTick', time(labs), 'XTickLabel', []);
The official documentation of plotyy and Using Multiple X- and Y-Axes can be of further help for you.
If you take a look on the example there, namely, plotyy documentation:
figure
x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);
[AX,H1,H2] = plotyy(x,y1,x,y2,'plot');
and as you did before, try to modify only the AX(2), which is equivalent to what you got writing gca:
set(AX(2),'XtickLabel',1:0.1:20)
you will observe that the same overlapping error takes place.
With respect to rotating the labels 90 deg, I'm afraid that's not currently supported by Matlab. However, you can probably get that done using one of the available packages on FileExchange. Either xticklabelrotate or Rotate Tick Label could be the one.
I want to create images like this from a double precision matrix using MATLAB.
Sample image:
http://twitpic.com/2xs943
You can create this sort of plot yourself pretty easily using the built-in functions imagesc and text and adjusting a number of parameters for the graphics objects. Here's an example:
mat = rand(5); % A 5-by-5 matrix of random values from 0 to 1
imagesc(mat); % Create a colored plot of the matrix values
colormap(flipud(gray)); % Change the colormap to gray (so higher values are
% black and lower values are white)
textStrings = num2str(mat(:), '%0.2f'); % Create strings from the matrix values
textStrings = strtrim(cellstr(textStrings)); % Remove any space padding
[x, y] = meshgrid(1:5); % Create x and y coordinates for the strings
hStrings = text(x(:), y(:), textStrings(:), ... % Plot the strings
'HorizontalAlignment', 'center');
midValue = mean(get(gca, 'CLim')); % Get the middle value of the color range
textColors = repmat(mat(:) > midValue, 1, 3); % Choose white or black for the
% text color of the strings so
% they can be easily seen over
% the background color
set(hStrings, {'Color'}, num2cell(textColors, 2)); % Change the text colors
set(gca, 'XTick', 1:5, ... % Change the axes tick marks
'XTickLabel', {'A', 'B', 'C', 'D', 'E'}, ... % and tick labels
'YTick', 1:5, ...
'YTickLabel', {'A', 'B', 'C', 'D', 'E'}, ...
'TickLength', [0 0]);
And here's the figure this generates:
If you run into trouble with the x-axis tick labels you choose being too wide and overlapping one another, here's how you can handle it:
Newer versions of MATLAB: Not sure which version this was added, but in newer versions axes objects now have the properties '{X|Y|Z}TickLabelRotation', which allow you to rotate the labels and fit them better.
Older versions of MATLAB: For older versions you can find some submissions on the MathWorks File Exchange that can rotate the tick label text, like XTICKLABEL_ROTATE from Brian Katz.
h = imagesc(magic(8))
impixelregion(h)
http://www.mathworks.com/help/toolbox/images/ref/impixelregion.html
Requires Image Processing Toolbox
If you only care about looking at zero/non-zero entries in your matrix (e.g. if it's sparse), use spy.
Else, use imagesc.
PS: I can't access your image
I expect you could persuade Matlab to draw that, if you look at the File Exchange you may find someone has already written the code. But it would be a lot easier, if you don't have the code, to use MS Excel.
EDIT: So I gave this some more thought and here's what I came up with. I've not mastered posting graphics to SO, so trust me, this will lead you towards a solution. But it would honestly be easier with Excel.
First define a matrix with your data values; I call the matrix G in the following. Then execute the commands:
image(G);
colormap(gray)
Now, I had to do some fiddling around, rescaling the data, to get a good graphic, but this should produce a gray-scale plot with numeric axes. Now, go to your figure window and open the plot tools.
Select the X axis and hit the Ticks button. All you have to do now is edit the labels to the texts that you want. Do the same for the Y axis. Write the numbers in the squares on the plot -- use the Text Box from the Annotations menu.
After a lot of fiddling about you'll have the graphic you want. At this point, I suggest that you choose the menu command File | Generate M-File and do just that. If you want to create such graphics programmatically in future just turn the generated M file into a proper function that does what you want.
But it's still a lot easier in Excel.