I wrote a simple convenience function to handle just this problem. Usage is: >> x = ones(1000); >> ByteSize(x) 7.63 Mb I run R2007a, so the problem of Java objects not returning sizes may have been fixed in subsequent releases. Here’s the code: function ByteSize(in, fid) % BYTESIZE writes the memory usage of the provide … Read more
If you are using numpy version 1.13.0 or later, you can use numpy.heaviside: In [61]: x Out[61]: array([-2. , -1.5, -1. , -0.5, 0. , 0.5, 1. , 1.5, 2. ]) In [62]: np.heaviside(x, 0.5) Out[62]: array([ 0. , 0. , 0. , 0. , 0.5, 1. , 1. , 1. , 1. ]) With … Read more
The command whos will do just that.
If you know the handle of line you want on top (e.g. because you called h = plot(…), you can use uistack uistack(h,’top’) Alternatively, you can manipulate the order of children of your current axes directly. The following puts the last-most curve on top. chH = get(gca,’Children’) set(gca,’Children’,[chH(end);chH(1:end-1)])
The dot itself is not an operator, .^ is. The .^ is a pointwise¹ (i.e. element-wise) power, as .* is the pointwise product. .^ Array power. A.^B is the matrix with elements A(i,j) to the B(i,j) power. The sizes of A and B must be the same or be compatible. C.f. “Array vs. Matrix Operations”: … Read more
There is more information about the functions of interest here: http://docs.scipy.org/doc/scipy-0.10.0/reference/tutorial/optimize.html Also, it looks like you are doing the Coursera Machine Learning course, but in Python. You might check out http://aimotion.blogspot.com/2011/11/machine-learning-with-python-logistic.html; this guy’s doing the same thing.
The ‘YDir’ axes property can be either ‘normal’ or ‘reverse’. By default it is ‘normal’ for most plots, but some plots will automatically change it to ‘reverse’, such as the image or imagesc functions. You can set the y-axis direction of an axes with either the set function or dot indexing (in newer MATLAB versions): … Read more
Short answer, the clc function: >> clc You can also select Edit > Clear Command Window in the MATLAB desktop (older versions) or select Clear Command Window from the Command Window pull-down menu:
not that i know of. subsref doesn’t seem to work in this case, possibly because the second variable isn’t even returned from the function. since matlab 2009b it is possible to use the notation [~, b] = function(x) if you don’t need the first argument, but this still uses a temporary variable for b.
Go to the command window, and hit Ctrl-C a lot. From my experience, on a single-core machine you do not have a chance, unless you do lots of output. On a multi-core or multi-processor machine, you’ll probably stop it eventually, but it takes time. See also http://www.mathworks.com/support/solutions/en/data/1-188VX/index.html Added: it is a good practice to (1) … Read more