Answer & check your solution
What colors blend to generate red
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ContentsThe Wolfram Language doesn ’ t just handle things like numbers. It also for example handles things like colors. It lets you refer to common colors by their names.
Red represents the color red:
You can do operations on colors. ColorNegate “ negates ” a color, giving the complementary color. Blend blends a list of colors together.
Negating the color yellow gives blue:
This gives maximum red, with no green or blue:
Maximum red and green gives yellow:
This gives a table of colors with maximum red and varying levels of green:
A hue of 0.5 corresponds to cyan:
Sometimes you may want to just pick a random color. RandomColor lets you do this. When you say RandomInteger[10] , you ’ re asking to generate a random integer up to 10. But for a random color you don ’ t have to specify a range, so you can just write RandomColor[ ] — not giving any explicit input to the function.
Generate a random color:
Make a table of 30 random colors:
Blending together lots of random colors usually gives something muddy:
This gives the number 1000, styled in red:
Here are 30 random integers, styled in random colors:
Show x styled in 30-point type:
This styles the number 100 in a sequence of different sizes:
You can combine color and size styling; here ’ s x in 25 random colors and sizes:
Red, Green, Blue, Yellow, Orange, Pink, Purple, . colors RGBColor[0.4,0.7,0.3] red, green, blue color Hue[0.8] color specified by hue RandomColor[ ] randomly chosen color ColorNegate[Red] negate a color (complement) Blend[] blend a list of colors Style[x,Red] style with a color Style[x,20] style with a size Style[x,20,Red] style with a size and color 7.1 Make a list of red, yellow and green. »
Expected output:
Answer & check your solution
7.2 Make a red, yellow, green column ( “ traffic light ” ). »
Expected output:
Answer & check your solution
7.3 Compute the negation of the color orange. »
Expected output:
Answer & check your solution
7.4 Make a list of colors with hues varying from 0 to 1 in steps of 0.02. »
Expected output:
Answer & check your solution
7.5 Make a list of colors with maximum red and blue, but with green varying from 0 to 1 in steps of 0.05. »
Expected output:
Answer & check your solution
7.6 Blend the colors pink and yellow. »
Expected output:
Answer & check your solution
7.7 Make a list of colors obtained by blending yellow with hues from 0 to 1 in steps of 0.05. »
Expected output:
Answer & check your solution
7.8 Make a list of numbers from 0 to 1 in steps of 0.1, each with a hue equal to its value. »
Expected output:
Answer & check your solution
7.9 Make a purple color swatch of size 100. »
Expected output:
Answer & check your solution
7.10 Make a list of red swatches with sizes from 10 to 100 in steps of 10. »
Expected output:
Answer & check your solution
7.11 Display the number 999 in red at size 100. »
Expected output:
Answer & check your solution
7.12 Make a list of the first 10 squares, in which each value is styled at its size. »
Expected output:
Answer & check your solution
7.13 Use Part and RandomInteger to make a length-100 list in which each element is randomly Red, Yellow or Green. »
Sample expected output:
Answer & check your solution
7.14 Use Part to make a list of the first 50 digits of 2^1000, in which each digit has a size equal to 3 times its value. »
Expected output:
Answer & check your solution
+7.1 Create a column of colors with hues varying from 0 to 1 in steps of 0.05. »
Expected output:
Answer & check your solution
+7.2 Make a list of colors varying from red to green with green components x varying from 0 to 1 in steps of 0.05 and with red components 1-x . »
Expected output:
Answer & check your solution
+7.3 Create a list of colors with no red or blue, and with green varying from 0 to 1 and back down to 0 in increments of 0.1 (the 1 should not be repeated). »
Expected output:
Answer & check your solution
+7.4 Blend the color red and its negation. »
Expected output:
Answer & check your solution
+7.5 Blend a list of colors with hues from 0 to 1 in increments of 0.1. »
Expected output:
Answer & check your solution
+7.6 Blend the color red with white, then blend it again with white. »
Expected output:
Answer & check your solution
+7.7 Make a list of 100 random colors. »
Sample expected output:
Answer & check your solution
+7.8 Make a column for each number 1 through 10, with the number rendered first in red then in green. »
Expected output:
Answer & check your solution
+7.9 Make columns of the numbers 1 through 10, rendered as plain, bold and italic in each column. »
Expected output:
Answer & check your solution
What named colors does the Wolfram Language have?
Red, Green, Blue, Black, White, Gray, Yellow, Brown, Orange, Pink, Purple, LightRed, etc. In Section 16 we ’ ll see how to use ctrl + = to enter any color name in plain English.
Basically because that ’ s how we humans perceive colors: there are three kinds of cells in our eyes that are roughly sensitive respectively to red, green and blue components of light. (Some other organisms work differently.)
What does color negation do?
What is hue?Yes. A common one (implemented by Hue) is to use the combination of hue, saturation and brightness. LABColor and XYZColor are other examples. GrayLevel represents shades of gray, with GrayLevel[0] being black and GrayLevel[1] being white.
- The little squares of color used to display a color are usually called swatches.
- You can specify named HTML colors by using for example RGBColor[“maroon”] , as well as hex colors by using for example RGBColor[“#00ff00”] .
- ChromaticityPlot and ChromaticityPlot3D plot lists of colors in color space.
- You can set lots of other style attributes in the Wolfram Language, like Bold, Italic and FontFamily.
Vomit color chart: What different colors mean
The color of a person’s vomit can vary depending on its cause. While some may be cause for concern, most vomit colors do not indicate a need for medical attention.
People may experience nausea and vomiting due to food poisoning, irritation of the gastrointestinal (GI) tract, or as a side effect of certain medications. If vomiting lasts only 1–2 days, it is typically not cause for concern.
However, if vomiting has a cyclic recurrence over weeks or months, this may be a sign of an underlying illness. Chronic conditions, such as irritable bowel syndrome (IBS), peptic ulcers, or reflux, may cause recurrent vomiting.
This article will review vomit colors, what they may mean, and when people should contact a doctor.
Clear vomit is most often from swallowed saliva. This often occurs the first few times a person vomits with an empty stomach, as there is nothing else in the stomach other than the saliva they recently swallowed.
- food poisoning
- cyclic vomiting syndrome
- morning sickness
- stomach flu
- motion sickness
- stress
Vomit may appear white when a person has eaten white foods, such as:
People may also experience foamy white vomit. This can occur due to certain underlying conditions that involve the digestive system or because of excessive alcohol intake.
Green vomit may suggest that a person is vomiting bile, a substance that the liver produces to help break down fat during digestion. The green color means that the stomach has not yet digested the bile.
Green undigested bile typically comes from the upper duodenum (the first part of the small intestine). If a person vomits this substance, it may mean that there is an obstruction or other potential issue. It may be a good idea for them to contact a doctor to discuss this.
Yellow vomit can indicate that a person is vomiting bile that the stomach has already digested. This may not be a cause for concern and may simply suggest that the stomach is empty.
Orange is the color of partially digested foods. People may experience orange vomit for the first several hours of an illness while the stomach fully empties.
It may occur due to an illness, such as viral gastroenteritis (also known as stomach flu) or any other condition that may cause difficulties digesting food, including :
Pink or red vomit may indicate the presence of blood.
Throwing up blood (hematemesis) may suggest bleeding in the upper GI tract. This may occur due to conditions such as a peptic ulcer or esophagitis.
People who notice blood in their vomit should seek immediate medical attention.
Brown vomit may suggest the presence of blood in the vomit. It may have a link to conditions such as peptic ulcers and alcohol-related hepatitis. People should seek medical attention if their vomit looks similar to dark coffee grounds.
Black vomit may signify that the vomit contains blood. The black color is typically due to partial digestion and oxidation that blood may have sustained in the stomach.
If a person experiences black vomit, they should seek immediate medical attention.
Experiencing changes in vomit color and texture is typically not a cause for concern.
The texture of vomit may change while the stomach is emptying. Similarly, the color may change as people initially vomit the contents of their stomach, then the vomit may appear yellow or green because of bile.
However, if a person notices any unusual texture, such as vomiting a substance similar to coffee grounds, they should contact a doctor.
People may consider contacting a doctor if their symptoms do not ease within 1–2 days. A doctor can address the causes of these symptoms and recommend the most appropriate treatment.
They should also contact a doctor if they experience any of the following:
- inability to keep fluids down due to vomiting
- signs of severe dehydration
- significant weight loss since the start of the illness
- vomiting that has lasted for more than 48 hours and is not getting better
- dizziness
- headache
People should seek medical attention if they experience any of the following:
- bloody vomit
- green-yellow vomit
- severe chest pain
- severe abdominal pain
- severe headache
- high temperature and stiff neck
People should also immediately contact emergency services if they think they may have ingested something poisonous.
Vomiting has links with many health conditions, some concerning and others less so, especially if short-lived.
The color and texture of vomit and the frequency at which people throw up may indicate the presence of an underlying condition.
Black, red, and brown vomit may indicate a more serious health condition for which people should seek medical attention.
If vomiting lasts for more than 48 hours, a person should contact a doctor regardless of the color of their vomit.
Last medically reviewed on August 30, 2023
- Public Health
- GastroIntestinal / Gastroenterology
- gastric
How we reviewed this article:
Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. We avoid using tertiary references. We link primary sources — including studies, scientific references, and statistics — within each article and also list them in the resources section at the bottom of our articles. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.
- Digestive diseases. (n.d.).
https://www.niddk.nih.gov/health-information/digestive-diseases - DiGregorio AM, et al. (2022). Gastrointestinal bleeding.
https://www.ncbi.nlm.nih.gov/books/NBK537291/ - Liu C, et al. (2021). Emerging progress in nausea and vomiting of pregnancy and hyperemesis gravidarum: Challenges and opportunities.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8785858/ - Roth N, et al. (2016). Alcoholic foamy degeneration and alcoholic fatty liver with jaundice: Often overlooked causes of jaundice and hepatic decompensation that can mimic alcoholic hepatitis.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6490664/ - Tello L, et al. (2016). Fluid and electrolyte therapy during vomiting and diarrhea.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7185384/ - Vomiting blood. (2022).
https://www.nhs.uk/conditions/vomiting-blood/ - Vomiting in adults. (2023).
https://www.nhsinform.scot/illnesses-and-conditions/stomach-liver-and-gastrointestinal-tract/vomiting-in-adults
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Medically reviewed by Harshil Matta, DO
Medically reviewed by Nancy Choi, MD
Medically reviewed by Sachin S. Kapur, MD, MS
Medically reviewed by Kerry Boyle D.Ac., M.S., L.Ac., Dipl. Ac., CYT- About Us
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© 2023 Healthline Media UK Ltd, Brighton, UK. All rights reserved. MNT is the registered trade mark of Healthline Media. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional. See additional information.
© 2023 Healthline Media UK Ltd, Brighton, UK. All rights reserved. MNT is the registered trade mark of Healthline Media. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional. See additional information.
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