plotting – Different kind of PlotStyle via Piecewise

I have a Piecewise. For vertical line I have to add Exclusions -> None.

    a1 = 1; 
    b1 = 2; 
    c1 = 2; 
    L(x_) := (x - a1)/(b1 - a1); 
    R(x_) := (c1 - x)/(c1 - b1); 
    A(x_) = Simplify(Piecewise({{0, x < a1}, {L(x), a1 <= x <= b1}, {R(x), Inequality(b1, LessEqual, x, Less, c1)}, {0, x >= c1}}, 0)); 
    p1 = Plot(A(x), {x, a1, c1 + 0.1}, PlotStyle -> {Black, Dashed}, Exclusions -> None)

What are the other options available? Can I make dashed to * or o.

What kind of Database /System setup are used in facebook, google drive, or any types of platform like apps?

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(Private feedback for you)

For example things like google drive, or even facebook individual pages, or some management apps, where the company that runs the app, give access to their customer ( like an organization, company, or individuals) of their own organization pages, the customer can set up admin access, user acces, and store data, do what ever within the features of the app.

What kind of database structure is that? Is that like giving customers access to create( or make a copy of the app structure to form) their own independent database ? Or is under one giant database that houses everybody but differentiated by a specific id but essentiall all together?

or like manageBac or other management app they use at schools or companies, it’s ManageBac company that people pay, so they have access to use the platform, but it’s also independently school manageBac, everything is this one school or organization , it has admin that gives permissions to different people, like admins, and regular staff, or teachers and student.

I wonder if it’s a independent set up database that we makde a empty entire copy the day we paid, then do our own things on it within the features and access, or it’s actually every organization/indivdual all mixed in ONE giant db, that only differentiate by unique keys or ids…

or the whole package is an object/class that has everything that instantiated by each user ?

How does that work?

Cheers guys!

Different colors for buttons that have different kind of action

I am currently working on a project that needs an overhaul. I came across an interesting concept which I personally did not use before.

This app has three types of buttons.

What the buttons do:

Cancel – Closes modals.
Add – Opens a modal which will contain a form.
Save – Saves your changes in a page or saves data inserted in the modal.

What colors look like:
Cancel – outlined – gray border & dark gray text
Add – filled – blue background & white text
Save – filled – green background & white text

Another thing that must be pointed out is that this application will have themes for each company that will use the product. Most likely the theme will customize the colors used and of course the logo (nothing else).


  1. My question is: Would you keep the green/blue difference or make them all blue? How will both cases work with the theming?

  2. What if I need to add a secondary button next to add and another secondary button next to save. Would they be outlined with the border same color as them?
    That would make 5 types of buttons in general. Would this be an issue?

Some in my team say that having color meaning is more important than the other aspects.
I personally would keep just one style for primary buttons and one for secondary (the gray outlined and the blue one). This in my opinion would be easier when it comes to theming the app.

What do you guys think?

Add button
Save button and Cancel

dnd 5e – Do you have to specify what kind of attack or weapon you will Ready?

It seems logical that you can use the Ready action to prepare to grapple or shove an opponent if triggered. But can you just Ready an attack, and then decide when it’s triggered whether to attack as normal or try to grapple or shove?

Similarly, you could certainly Ready a specific weapon attack like “if a creature moves within 5′ of me, I swing my mace” or “if any of them draw a weapon, I shoot an arrow at them”. But could you just say “I Ready an attack, if any of the creatures move close to us?” and then, when it is triggered, decide which weapon to attack with, whether to attack with melee or range, or (as above) whether to use a weapon or grapple/shove? Or disarm?

A similar situation is Help – you could be planning to help one character do something, but by the time of the trigger, prefer help someone else do something else. Could you just say that you are Ready to Help whoever might need it when (trigger)?

Essentially, how specific do you have to be about the Action you are Readying? Can you be as general as saying you will Ready a move, an Attack, a Help, etc.? Or do you have to say who you will Attack, how (melee/range) and with what weapon, or who you will Help and with which of their Actions, etc.?

What kind of music do you listen during text creting?

I like rock or country..

What kind of card sorting is the best?

I have an online grocery website, it includes different categories and subcategories, I want to test the the usability of categories tree, in this case closed card sorting or open card sorting is the most suitable? and how many people should participate ?

canon – What kind of lighting gear should I consider for macro shooting?

Next week I will receive a Canon EOS 6D Mark II. It’s my first camera. I have also bought the Canon EF 100 f/2.8L Macro IS USM lens. I am very interested in doing macro photography.

My question is about lighting for macro photography with my new camera. I’ve found things like the Lume Cube Panel Mini, but I am not really sure whether this is good solution or not.

Mostly I will be shooting out in the field in nature, so I know I want something portable (in a backpack) and battery-powered, but I’m not sure what else I should be looking for. What type of gear should I be looking at, and what lighting features are important to a macro shooter?

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What kind of data do Google and Samsung collect from the OS itself?

Not including apps and websites. I’ve switched to open source phone, SMS, calendar, etc. and I use the DuckDuckGo browser to try to block some of the web trackers. What kind of data can Google and Samsung still see through stuff like Google Play Services and other OS level stuff? I assume they’re still scanning WiFi and Bluetooth signals to try and approximate your location. What data do they collect and can it be stopped without flashing a custom ROM?

astrophotography – What kind of camera do I need to capture deep space images?

Unfortunately, a lot of images like the one you show here are digitally altered and it is difficult to get comparable results. The image above shows the Milky Way, looking approximately at its center, which appears to us to be in the constellation of Sagittarius.

To get such a detailed view of the comparatively dark nebulous structures, however, you need to use really long exposure times. Unfortunately, because of the stars’ apparent rotation, exposures above approximately 25 seconds (for wide angle lenses; the smaller your lens angle, the shorter the time) begin to show star trails. So I doubt that the image you show was really created as one exposure. If so, the photographer must have used an extremely low-noise semsor with exceptionally high sensitivity.

The linked “star trail” image (which shows the telescope I work for, by the way) used a technique called “stacking”. To create it, 70 1-minute-exposures were added together. This is a common method that allows you to get very good images using a normal DSLR and an external timer/trigger.

If you stack the images so that the star “pinpoints” are on top of each other, you will get a detailed skyscape with blurred foreground. This is what I suppose was done in your example image: The sky was images with a series of exposures, stacked together for greater sensitivity, and the foreground has likely been added afterwards.

Of course, instead of doing that much digital manipulation, you can also follow the traditional route and mount your (D)SLR on a tracking mount. A good description with sample images that show what to expect from real-world exposures is given on the “bedfordnights” Geocities page (link to archived copy at Internet Archive).

Edit: I forgot to address your question regarding location. Yes, it depends on the location: For one thing, the center of the milky way (which is its brightest area) gets higher above the horizon when you move from the poles to the equator. But most importantly, images of the quality you show above are only possible from the darkest locations on the planet (which sounds exotic and adventurous, but essentially means “anywhere where there are no human settlements causing light pollution in about 200 km radius”).