Download A Primer on Scientific Programming with Python (4th Edition) by Hans Petter Langtangen PDF

By Hans Petter Langtangen

The publication serves as a primary advent to laptop programming of clinical purposes, utilizing the high-level Python language. The exposition is instance and problem-oriented, the place the functions are taken from arithmetic, numerical calculus, information, physics, biology and finance. The ebook teaches "Matlab-style" and procedural programming in addition to object-oriented programming. highschool arithmetic is a required historical past and it's constructive to review classical and numerical one-variable calculus in parallel with interpreting this ebook. in addition to studying find out how to software desktops, the reader also will the way to clear up mathematical difficulties, coming up in numerous branches of technological know-how and engineering, via numerical tools and programming. via mixing programming, arithmetic and clinical functions, the ebook lays a high-quality beginning for practising computational technology.

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Additional info for A Primer on Scientific Programming with Python (4th Edition) (Texts in Computational Science and Engineering, Volume 6)

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83576461, 0. ], [ 0. 32038375, 0. ], [ 0. 89318572, 0. ], [ 0. 45222715, 0. ]]) We can visualize the output. Notice how each value is sited on the x, y, or z axis along with the other values and 0; this is called sparseness. If you look closely, you can see there was some training error. One of the classes was misclassified. Only being wrong once isn't a big deal, though. transform(iris_data[1::2]) 40 Chapter 1 The following screenshot shows its performance: Notice again that there was some error in the classification.

2]]) If the data is missing values, it might be inherently dirty in other places. For instance, in the example in the preceding How to do it... nan (the default missing value) was used as the missing value, but missing values can be represented in many ways. Consider a situation where missing values are -1. In addition to the strategy to compute the missing value, it's also possible to specify the missing value for the imputer. nan values. To see an example of this, modify iris_X to have -1 as the missing value.

This recipe will boil down to the explicit features from our samples in an attempt to understand the independent variables as much as the dependent variables. decomposition import FactorAnalysis How to do it... com. packtpub. com/support and register to have the files e-mailed directly to you 31 Premodel Workflow Compare the following plot to the plot in the last section: Since factor analysis is a probabilistic transform, we can examine different aspects such as the log likelihood of the observations under the model, and better still, compare the log likelihoods across models.

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