singular

问题 There are a lot of questions explaining how to echo a singular or plural variable, but none answer my question as to how one sets a variable to contain said singular or plural value. I would have thought it would work as follows: $bottom="You have favourited <strong>$count</strong> " . $count == 1 ? 'user':'users'; This however does not work. Can someone advise how I achieve the above? 回答1: This will solve your issue, thanks to mario and Ternary operator and string concatenation quirk?

问题 There are a lot of questions explaining how to echo a singular or plural variable, but none answer my question as to how one sets a variable to contain said singular or plural value. I would have thought it would work as follows: $bottom="You have favourited <strong>$count</strong> " . $count == 1 ? 'user':'users'; This however does not work. Can someone advise how I achieve the above? 回答1: This will solve your issue, thanks to mario and Ternary operator and string concatenation quirk?

问题 The following code shows a problem of singularity of a matrix, since working in Pycharm I get raise LinAlgError("Singular matrix") numpy.linalg.linalg.LinAlgError: Singular matrix I guess the problem is K but I cannot understand exactly how: from numpy import zeros from numpy.linalg import linalg import math def getA(kappa): matrix = zeros((n, n), float) for i in range(n): for j in range(n): matrix[i][j] = 2*math.cos((2*math.pi/n)*(abs(j-i))*kappa) return matrix def getF(csi, a): csiInv =

问题 This question could refer to any computer algebra system which has the ability to compute the Groebner Basis from a set of polynomials (Mathematica, Singular, GAP, Macaulay2, MatLab, etc.). I am working with an overdetermined system of polynomials for which the full groebner basis is too difficult to compute, however it would be valuable for me to be able to print out the groebner basis elements as they are found so that I may know if a particular polynomial is in the groebner basis. Is there

问题 This question could refer to any computer algebra system which has the ability to compute the Groebner Basis from a set of polynomials (Mathematica, Singular, GAP, Macaulay2, MatLab, etc.). I am working with an overdetermined system of polynomials for which the full groebner basis is too difficult to compute, however it would be valuable for me to be able to print out the groebner basis elements as they are found so that I may know if a particular polynomial is in the groebner basis. Is there

问题 The matrix below is singular, and AFAIK attempting to invert it should result in numpy.linalg.linalg.LinAlgError: Singular matrix but instead, I do get some output matrix. Note that output matrix is a non-sensical result, because it has a row of 0's (which is impossible, since an inverse of a matrix should itself be invertible)! Am I missing something here related to floating point precision, or the computation of a pseudoinverse as opposed to a true inverse? $ np.__version__ '1.13.1' $ np

问题 I am modelling data for a logit model with 34 dependent variables,and it keep throwing in the singular matrix error , as below -: Traceback (most recent call last): File "<pyshell#1116>", line 1, in <module> test_scores = smf.Logit(m['event'], train_cols,missing='drop').fit() File "/usr/local/lib/python2.7/site-packages/statsmodels-0.5.0-py2.7-linux-i686.egg/statsmodels/discrete/discrete_model.py", line 1186, in fit disp=disp, callback=callback, **kwargs) File "/usr/local/lib/python2.7/site

问题 I am using numpy.cov to create a covariance matrix from a dataset of over 400 time series. Using linalg.det gives me a value of zero so matrix is singular. I can use linalg.svd to see that the rank is two less than the number of columns so somewhere in the covariance matrix I have some linear combinations to make the matrix degenerate. I have used corrcoef on the underlying timeseries but no correlation > 0.78 so not obvious there. Can someone suggest a method to determine the location of the

问题 I need to solve more than thousand matrices in a list. However, I get the error Lapack routine dgesv: system is exactly singular . My problem is that my input data are non singular matrices, but following the calculations I need to do on the matrices some of them get singular. A reproducible example with a subset of my data is however not possible as it would be to long (I tried already). Here a basic example of my problem (A would be a matrix after some calculations and R the next

问题 I'm looking for a function that given a string it switches the string to singular/plural. I need it to work for european languages other than English. Are there any functions that can do the trick? (Given a string to convert and the language?) Thanks 回答1: There is no function built into PHP for this type of operation. There are, however, some tools that you may be able to use to help accomplish your goal. There is an unofficial Google Dictionary API which contains information on plurals. You