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Thanks to the comment from TrentonMcKinney I realized what the issue was:

In my case:

The values in each of my rows are the same, but each row is increasing.

But what I need for streamplot to work is:

Each row is the same, but the values in each row are increasing.

So I changed indexing = 'ij' to = 'xy':

ppp2 does not equal ppp3 because they are two different instances of a class. You could override the '==' operator to check if each field is the same. ie. ppp2.id == ppp3.id.

eg/ (taken from equatable docs but this is vanillar dart)

I had this issue as well and came about several situations that could cause it.

First one: It could be a broken path in your env variables. You can check all paths by doing a simple "echo %PATH%" in your terminal and removing those that don't point to a valid location.

Second one: Make sure that your project path doesn't include an '&' as stated on this issue here: https://github.com/flutter/flutter/issues/41547

Third one: Another one that I found is that after uninstalling Anaconda it left out an AutoRun key in the command processor registry (in your case it may have been Firebase).

Check these places in regedit for broken links: Computer\HKEY_CURRENT_USER\Software\Microsoft\Command Processor Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Command Processor

One example of making a loop over time variable and maps of variable inside the loop, is here:

Right now packages are still being adjusted for null safety so till then you have to opt out of null safety while building by changing your main.dart like

If you get the image URL from a database, you need to provide it with the absolute URL

If you want to plot a scalar field with irregular data points, you can either interpolate between data points to form a regular grid, or you can use matplotlib.pyplot.tricontour and tricontourf to interpolate for you to fill.

Using tricontour you could try:

Set them all toany, then run flutter pub get.

Now you can look in the pubspec.lock file and see what versions you got and put them in pubspec.yaml.

You can create multiple plots next/below each other via plt.subplots(nrows=1, ncols=1). Take a look at the documentation for examples.

If you want to create multiple plots in one, you could share the x or y axis via ax.twinx() or ax.twiny().