sylvester | Vector , matrix and geometry math JavaScript | Math library

You need to use ListIndex:

You are on the right track. Note that your definiteness constraint reduces to a simple bound on the optimization variable, i.e. -∞ <= x[0] <= VAR_X*VAR_Y. Variable bounds are better handled internally than the more general constraints, so I'd recommend something like this:

I'm not certain if this is the case for Volterra kernels, but many kernels are positive definite, and some kernels, such as covariance functions, do not admit values less than zero (e.g. Squared Exponential/RBF, Rational Quadratic, Matern kernels).

If these are not the cases for the Volterra kernel, you can also try changing the random seed to seed the RNG differently to check if this is still the case. Here is a looped version of your code that iterates over different random seeds:

3 errors in question 2:

1. missing ( ) around the if condition
2. in the second part of the if condition there must be double ==
3. { } are missing

To be a valid code it must be set like this:

IIUC, you have a percentage of the data labelled and require labelling the remaining data. I would recommend reading about Semi-Supervised machine learning.

Semi-supervised learning is an approach to machine learning that combines a small amount of labeled data with a large amount of unlabeled data during training. Semi-supervised learning falls between unsupervised learning (with no labeled training data) and supervised learning (with only labeled training data)

Sklearn provides quite an extensive variety of algorithms that can assist with this. Do check this out.

If you need more insight into this topic I would highly recommend checking this article out as well.

Here is an example with the iris data set -

Collection initializers for List and Dicitionary use internally Add method, for List it is public void Add (T item); and for dictionary it is public void Add (TKey key, TValue value);, so Dictionary collection initializer does not actually construct KeyValuePair to pass it to the Add method and this code:

The dictionary comprehension only has separate expressions for key and value. k : v by itself isn't a valid expression, so it can't be nested inside an if-then-else expression either. You'd need to wrap key and value each in a separate if-then-else expression for it to work.

Luckily, as the key is the same in both cases, you just need to make an expression for the value.

try:

Why not simply:

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