What is Calculator: Definition and 516 Discussions
An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics.
The first solid-state electronic calculator was created in the early 1960s. Pocket-sized devices became available in the 1970s, especially after the Intel 4004, the first microprocessor, was developed by Intel for the Japanese calculator company Busicom. They later became used commonly within the petroleum industry (oil and gas).
Modern electronic calculators vary from cheap, give-away, credit-card-sized models to sturdy desktop models with built-in printers. They became popular in the mid-1970s as the incorporation of integrated circuits reduced their size and cost. By the end of that decade, prices had dropped to the point where a basic calculator was affordable to most and they became common in schools.
Computer operating systems as far back as early Unix have included interactive calculator programs such as dc and hoc, and calculator functions are included in almost all personal digital assistant (PDA) type devices, the exceptions being a few dedicated address book and dictionary devices.
In addition to general purpose calculators, there are those designed for specific markets. For example, there are scientific calculators which include trigonometric and statistical calculations. Some calculators even have the ability to do computer algebra. Graphing calculators can be used to graph functions defined on the real line, or higher-dimensional Euclidean space. As of 2016, basic calculators cost little, but scientific and graphing models tend to cost more.
In 1986, calculators still represented an estimated 41% of the world's general-purpose hardware capacity to compute information. By 2007, this had diminished to less than 0.05%.
I need a new calculator. I always wondered what the M buttons on a calculator were for, and today I finally got around to Googling for it. Pretty cool.
While watching videos explaining various calculator buttons, I found that some calculators have a 2nd button and a format button where you can...
On
https://www.amazon.com/worldengine-Combinations-Calculator/dp/B01GSTMZ4U?tag=pfamazon01-20
I found the command as indicated in the Summary. The Alexa in question (of a student of mine -- I am not very familiar with Alexa) would answer other calculation questions, but not this one. Is this an...
my notebook says that we can rewrite the integral
$$\int {75\sin^3(x) \cos^2(x)dx}$$
as
$$\int {75 \cos^2(x)\sin(x)dx} - \int {75\sin(x)\cos^4(x)dx}$$
however, i have literally no idea how it got to this point, and i unfortunately can't really provide an "attempt at a solution" for this...
I've become fascinated with how repeat doses of medications affect the body's level of the drugs (see sample diagram).
Is there some sort of online software grapher that takes params such as half-life and plots a graph?
I guess this is exactly what Wolphram Alpha does isn't it? I tried it once...
Re: "A glitch in Jorrie's Cosmo-Calculator"
LightCone8 has just been released with a number of glitch-fixes.
We now have a core team looking after it, namely: @Jorrie , @pmbuk and @JimJCW.
Here is the last post from the referenced thread.
Could be nice to have for model comparison, but we know...
I have a two-variable inequality and wish to make a graph of the regions in which it is satisfied. Is any such took available online for free?
A great many free online graphing calculators are available, but I expect the great majority won't do what I want.
Specifically I want to find the...
Hello, it may be a little bizarre but I've a question: is there a significant figures mode on AUKORZ AK-991EX calculator? Or in a general CASIO fx-991EX?
I tried to find states in direct method using ##\frac{E}{E_0}=\:nx^2+ny^2+nz^2## and ##100\:<nx^2+ny^2+nz^2\:<\:136##
But it was too long, found it using phi approximation there are around 300 energy states, and Python find around 271 states using direct method but I need manual or recursive...
hi guys
I am trying to publish a paper and finally it got a moderate revision, but there is a little problem :
after submitting the revisions which wasn't much, I received an email from the publisher saying "We notice that you may have used previously published material in your article" , the...
I have to solve a certain numerical problem without using calculator and furthermore, there is a time limit for solving this problem.
The answer I have got so far is ## \sqrt{\frac{100}{99}}##
I know I can reduce the numerator to 10 but then I am stuck with square root of denominator which is...
(you have your nows and thens mixed around)
You can obtain those values from the calculator, I think, but not directly. Since these are still points on the same lightcone, all it takes is to call the outputs for the desired redshifts, like so:
Then deduct the corresponding distances and...
I think the solution should be:
METHOD #1:
\begin{align} (\sqrt[4] {-1})^4 & = (-1)^{\frac 4 4} \nonumber \\ & = (-1)^1 \text{, can reduce 4/4 since base is a constant and not a variable in ℝ} \nonumber \\ & = -1 \nonumber \end{align}
Alternatively, METHOD #2 for same answer is...
Considering the measure of angles in radians, that are real numbers, the concept of of trigonometric function spreads to all real numbers. Any real number can be considered as an angle of the first circumference and a ##\mathbb{K}## number of circumferences.
We can consider the function...
Hi PF, hope to be publishing in the right forum
<moderator's note: moved to the right forum :smile:>
##\arccos{\dfrac{\sqrt{2}}{2}}\mbox{rad}=\dfrac{\pi}{4}\mbox{rad}##
This is a trigonometric true, but I've read the steps in my guideline, and I don't manage. The calculator is a chinese...
I have the problem with checking solution in calculators. For example wolfram doesn't give result of this equation. Have you any idea what is going on? Maybe should I simplyfy something. The equation is placed in photo.
I am trying to get one step further with my search for \sum_{n=1}^{\infty}\frac{1}{n^{2s+1}} . Part of the way is to calculate some algebraic expressions containing fractions with really huge numbers (as in (\frac{1}{5^{9}}+\frac{1}{7^{9}}-\frac{1}{17^{9}}-\frac{1}{19^{9}})\div...
Hello,
https://www.fxsolver.com/solve/
I am using this calculator to figure out how large/heavy a flywheel I need to produce torque of 200kg, or that could resist a force of 200kg applied to it.
I am not proficient in mathematics, so my terms or what I'm asking might be not phrases correctly...
So we'd like to find leg C.
But we can't use Law of Cosines yet so we will use Law of Sines.
We can easily find the length of A and this is ##\sqrt{13}##.
With some geometry we can see that ##\angle a = 53.1##.
We can now use Law of sines.
$$\frac{\sin(a)}{A} = \frac{\sin(b)}{B}$$
We want to...
import math
def derivative_quotient(f, a, h):
return float((f(a + h) - f(a)) / h)
if h==0:
return "Division by zero is not allowed."
Here is my code so far, I am unsure of where to go from here or if I am even on the right track. I am a little confused what it means by "where...
I am attempting to build a calculator that will calculate the tilt of a different shapes of packages traveling along a conveyor. the variables I am most interested in considering are: length, width and height of the package; speed of conveyor; radius and degree of turns.
Can anyone provide me...
I saw a post here about calculating damage per second (DPS) and tried to modify it to my need. https://mathhelpboards.com/pre-algebra-algebra-2/formula-calculating-dps-damage-per-second-18847.htmlis the original post.
My attack power is 46722 and I make 2.15 attacks a second, that come to be a...
Speaking of trigonometry without a calculator, I usually only memorizes the trig values of 30°, 45° and 60°. then by I can apply basic equations and applying to polygons or other geometry shapes I can get trig values for angles like 15° Or 75°. When people have enough time, people on Wikipedia...
So, I was in class listening to my lecturer when I notice something intriguing. I was looking at the reflection of a lamp on the screen of my calculator. I paid close attention to the colour of the light reflected of my calculator and realized that when I rotate my calculator by about 90 deg...
Summary: A short introduction to a antique calculator that I recently got
I first know about this thing when I was chatting with @jedishrfu a couple months ago, and I was fascinated by it. It functions like a soroban but looks way cooler and easier to carry around. Also, it is a important...
im trying to complete mips program code about a calculator program that can calculate integer addition / subtraction written using the MIPS assembler.
im having hard times to debug this.
The input is given to the array of Formula char (base address $ s0) in the form of a formula.
The null...
Hello!
Happy Sunday, I am trying to create a MATLAB GUI that can take an input ( i am starting out with just one variable) and take its derivative and display the result. I have attached pictures of what my GUI looks like, and also the code I wrote so far.
Let me also describe my method:
I have...
Hi everyone,
I am using a online y plus calculator to work out the y plus value for a fuel bundle.
http://www.pointwise.com/yplus/
In regards to the reference length, I have been told by peers to utilise the hydraulic diameter using 4A/P
where A is the cross sectional area, and P is the wetted...
Greetings everyone,
I thought this would be the place to pose this question. In the TV show Numb3rs Charlie plays with something I am not familiar with.
Wooden base
4-5 wire half rounds with beads on each half round.
Anyone know what this is? A calculator or toy?
Hello friends...
I'll jump right into the deal here.. I pranked a friend by putting a raspberry pi into a yoda head like the one on his desk. There's an intro video: and the prank itself: if you are intrigued.
Everything in the head runs off 3 AAA batteries. 1 raspberry pi zero w, 1 small...
I have been digging into the manual to figure out how to show digit separator (e.g 100,000). I do not seem to be able to find anything even though I have a vague memory that I have done it about a year ago. All I am managing to do is limit decimal places and show 100k instead of 100000.
If...
# include <stdio.h>
int main()
{
int n1,n2;
char s;
printf("Enter the first number:");
scanf("%d",&n1);
printf("Enter the second number:");
scanf("%d",&n2);
printf("Type the operation symbol that you want to do:");
scanf("%c",&s);
printf("%c",s);
if (s...
is anyone aware of a Bethe-Bloch calculator for the web? I have a plastic scintillator 1 in thick and am trying to estimate energy loss of cosmic ray produced muons. Thanks
So I am making a Delta V calculator. Here it is: https://www.desmos.com/calculator/hib7psndtb
Anyone know how to figure out a rocket's Delta V if it launches from in an atmosphere?
Also, if I messed up on anything (in the Delta V calculator or isp calculator), please let me know so I could...
I am an Mechanical Engineering student, coming to US next semester as a year 3 exchange student.
Is a graphical calculator is necessary to survive as a mechanical engineering student in US?
I have no previous experience in graphical calculator (we are only allowed to use scientific calculator...
Hey guys I was wondering if anyone knew of any good apps for the ti-nsipre calculator that was either a step by step solver or just a solver in general of problems like the one in the picture. I realize the picture is just setting up the expression but a solver for when there are actual values...
I am not sure where to ask this question but I must try somewhere.
1. Homework Statement
I am trying to graph a simple cdf on my ti-84 and I cannot get it to work.
I need an example to follow
Homework Equations
See below.
The Attempt at a Solution
2nd, dist, 2
enter -1E99,0 0,.5
[/B]I also...
Hi there,
I'm hoping somebody can help me. I have to evaluate the following expression using BIDMAS rules without using a calculator: 1-2/32
I can get as far as 1-2/9 but the answer is 7/9. I don't understand how to get from 1-2/9 to 7/9 in my head. For instance 2/9 = 0.2 recurring, but...
So I have a TI-84 Plus Silver edition that I've had for 10 years. It's kind of beat up but it works perfectly fine. I know the model has been discontinued in favor of a newer one, and I've already encountered a feature it lacks due to its age (it was something in an introductory stats course, I...
G'day!
I am in need of a nudge. My basic math understanding is being called to question by the arctan function.
Two values of arctan(-3) result:
a) In my textbook: 108.43 degrees
b) In my calculator: -71.56 degrees
It's perplexing and my superior has not put in a kind word either.
Would...
Given the function:
$$f(x) = x^3+20x-17.$$
Denote the roots of the function: $r_1,r_2$ and $r_3$.
Evaluate (without a calculator) the product: $f(r_1+1) \cdot f(r_2+1) \cdot f(r_3+1)$.
HI y'all! I was just told by my programming teacher that I need a new graphing calculator. She told me to decide between the TI 89, Casio Classpad fx-cp400 (or fx cp500) or the TI-Nspire CX C.A.S. I don't know if greyscale or color matters though in the long run. I am a programmer and need...
Hello,
I have a question. I have to create a calculator for grades. I need to make a menu and the student picks either the lab or the lecture which I didn't have a problem with. I also didn't have a problem with the set up of the questions or the average calculations. What I am stuck on is: I...
I'm getting pretty discouraged because I'm a straight A engineering student, but this semester I'm getting bad grades because I'm plugging things into my calculator wrong. I study a ton, and I definitely know the material, I just plug things into my calculator wrong and get the wrong answer.
In...
Trying to complete some homework help I got a bit stuck on an elementary or common problem that was always a bit difficult.
I have a function f(x) and just want to plot log f(x) against log x. This is common in chemistry and biochemistry. It should have been easy. :redface:
I have picked up...
OK, my trusty 25 year old 32S II is finally showing its age - a row of buttons on the right side of the keyboard seem to have some intermittent connectivity problem. So, I figure it is time to upgrade. I want RPN - algebraic entry is irrelevant to me.
The choices seem to be either the 35S or...