## woocommerce Version 4.6.1 doesn’t allow me to add Variable Products

I am experiencing a problem with woocommerce after updating both wordpress and woocommerce to the latest version. My shop has many products and only a few are simple products. I am unable to create a variable product since last update. What should I do?

## Is it possible to not differentiate through an undefined variable?

Suppose I have some $$\lambda$$ that is a function of $$x$$, and I don’t know exactly what it is yet.

Then, doing the following differentiation D[lamb, x] gives zero. But what I really want is to not have Mathematica evaluate the expression, i.e., just leave it as it is until I know $$\lambda$$ later.

Is there a way to achieve this? Thanks!

## Update variable value via add_filter

I have this apply filter in my plugin.

$pre_html = apply_filters( 'events_views_html', null,$  view_slug, $query,$  context ); 

## Maximize an expression with respect to a variable and minimize it with respect to other variables

I started to use Mathematica a few time ago. I want to minimize the following expression (function of $$l,p,q,r,c$$) with respect to variables $$l, p, q, r$$ and then maximize the result obtained with respect to variable $$c$$. However, when I try to obtain an expression function of $$c$$ to maximize later using Minimize, I do not get any result because it takes too long. How can I solve this issue?

Minimize[{(((l^2/2)*(1-(1/4-c))+(l*p)*(1-1/4)+(l*q)*(1-(1/4+c))+(l*r)*(1-1/2)+(p^2/2)*(1-c)+(p*q)*(1-2*c)+(p*r)*(1-(1/4+c))+(q^2/2)*(1-c)+(q*r)*(1-1/4)+(r^2/2)*(1-(1/4-c)))/((l^2/2)*(1-(1/4-c))+(l*p)*(1-1/4)+(l*q)*(1-(1/4-c))+(l*r)*(1-0)+(p^2/2)*(1-c)+(p*q)*(1-(1/4-c))+(p*r)*(1-0)+(q^2/2)*(1-(1/4-c))+(q*r)*(1-1/4)+(r^2/2)*(1-0))), l >= 1, p >= 0, q >= 0, r >= 0, l + p + q + r == 1000000, 1/7<c<1/5}, {l, p, q, r}] 

## Change product_type from simple to variable in WooCommerce

I know that WooCommerce plugin store product_type in taxomony I use that code

// TODO change taxonomy // product_type = variable $terms = get_the_terms($  post_id, "product_type"); foreach ($terms as$  term) {     $termId =$  term->term_id;     // TODO figure out why is not work     wp_update_term(\$  termId, "variable"); } 

Why it not works?

## Using slot and application to variable length vector

I have a list of 2D coordinates with a maximum length of 3, e.g.

peakdatAB {{1007.81, 8.64842}, {1008.38, 8.19264}} 

I need to generate something like this

({PointSize[0.01], Blue, Point[#1], Red, Point[#2], Black, Point[#3]}) & @@ peakdatAB 

but here the problem is the variable length of peakdatAB as when there is say no third point, it returns an error. How can I fix this?

## Searching for substring in field that contains variable length of arrays of json objects

I am trying to construct a sql query, that searches for a substring within a field. The issue is that the field contains an array of one or more json objects.

For example the table looks like so:

day     |   items ____________________ Sunday  | [{"apples":5, "bananas":2}, {"pears":12, "cucumbers":9}, ...] Monday  | [{"apples":6, "bananas":1}, {"watermelon": 1}] Tuesday | [{"apples":4, "bananas":3}, {"tomatoes": 1}] 

How do I construct a SQL query that searches for a substring in items given it is not a string ?

Thanks