Python scipy.zeros_like() Examples

The following are 2 code examples of scipy.zeros_like(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module scipy , or try the search function .
Example #1
Source File: rlocus.py    From python-control with BSD 3-Clause "New" or "Revised" License 6 votes vote down vote up 
def _RLSortRoots(mymat):
    """Sort the roots from sys._RLFindRoots, so that the root
    locus doesn't show weird pseudo-branches as roots jump from
    one branch to another."""

    sorted = zeros_like(mymat)
    for n, row in enumerate(mymat):
        if n == 0:
            sorted[n, :] = row
        else:
            # sort the current row by finding the element with the
            # smallest absolute distance to each root in the
            # previous row
            available = list(range(len(prevrow)))
            for elem in row:
                evect = elem-prevrow[available]
                ind1 = abs(evect).argmin()
                ind = available.pop(ind1)
                sorted[n, ind] = elem
        prevrow = sorted[n, :]
    return sorted
Example #2
Source File: util.py    From Azimuth with BSD 3-Clause "New" or "Revised" License 5 votes vote down vote up 
def ranktrafo(data):
    X = data.values[:, None]
    Is = X.argsort(axis=0)
    RV = sp.zeros_like(X)
    rank = sp.zeros_like(X)
    for i in xrange(X.shape[1]):
        x =  X[:,i]
        rank = sp.stats.rankdata(x)
        rank /= (X.shape[0]+1)
        RV[:,i] = sp.sqrt(2) * sp.special.erfinv(2*rank-1)

    return RV.flatten()