MATLAB Flashcards by Anna Belle

what does matlab stand for?

matrix labratory

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what must you create if you want to create a command sequence?

you must create a script or M-file

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what does “clc” stand for?

clear all commands

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What does MATLAB consider all numbers as?

floating point numbers

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what does the “whos” command do?

tells you what variables have been defined in the workspace

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when matlab accesses or stores information, what window does it use?

the current folder is used

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T/F, can matlab variables have the same name as built in functions?

true

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what does the “which” command do?

it allows you to check whether or not your variable name is the same as a built in matlab function

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Does matlab read white space?

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define exponent overflow

exponent overflow is when a number is above the MATLAB data range

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what does a variable that is above the acceptable matlab data range appear as?

inf

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define exponent underflow

exponent underflow occurs when a number is divided by zero

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3/0 will return what?

inf

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name how to use the linspace() command

(initial value, final value, number of values you want)

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what does the linspace() command do?

the command returns a specified quantity of numbers evenly spaced between the initial and final values specified in the command

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How does matlab process a matrix that is being called with numbers?

as a single column matrix where the numbers represent different elements

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in matlab, is it valid to have a matrix that is empty?

yes it is valid to have an empty matrix

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what should you look out for when expressing a variable in scientific notation with matlab?

it is important to omit blanks between the mantissa and the exponent

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what is “6.02 e23” read as in matlab

6.02 and 10^23

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what does “format long” do?

shows 14 points past the decimal

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how does matlab print integers?

as integers

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what does “format short” do?

shows 4 decimal points

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what does “format bank” do?

shows 2 decimal points

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does changing your display affect your data values?

no, matlab does its calculations with double point precision

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how does matlab print numbers that are too large for its default format?

in scientific notation

what does "format long e" do?

it formats all numbers in scientific notation

what does "format +" do?

displays an array's elements as "+" or "-" based on whether or not they are positive or negative

what does the disp() function display?

it displays a number without its variable

what is the print format in matlab?

fprintf('text' , variables, ... )

what does the width field control in matlab?

the number of characters to be printed

what is the precision field in matlab?

preceded by a decimal, it controls the number of digits shown past the decimal point

what can matlab script files be saved as?

.m or .dat files

where are saved matlab files stored?

in the current directory

what is a script M-file?

a list of matlab statements

how do you use the rem() function in matlab?

remainder(numerator , denometer)

how can you find out what a function does in matlab/

type: help (function in question)

what does the sign() function do?

the sign() function returns -1 if a number is negative and a 1 if a number is positive

if: x = [1, 3 , 5] [a,b] = max(x) will be equal to what?

a= 5 b = 3

how does the mean() function work?

the mean function computes the average in each column

how does the sort() function work?

the sort() function will return the values of a matrix in ascending order

if: x = [1 3 5] [a,b] = size(x) will return what? what about size(x) ?

a =1 b = 3 1 3

how does size () = [a,b] work?

size

what does rng('default') do?

sets the random number seed to a default seed

what will rand(n) return?

a matrix with n rows and n columns with random numbers

what will rand(n,m) return?

a random matrix with n rows and m columns

what will rani(imax, n) return?

an matrix with n rows and n columns with values between 1 and imax)

what does randn(n) return?

gaussian random numbers between -1 and 1 with a mean of zero and a variance of 1

entering what command allows you to layer multiple figures in matlab?

the "hold on" command

what is the format of a standard 2D plot with a title and x/y labels?

plot(xvar, yvar) , title('title name'), xlabel('name'), ylabel('name')

what does the "hold off" command do?

matlab will stop layering plots

what is the default color for matlab graphs?

blue

what is the format for a plot with multiple lines in matlab?

plot(x,y1 , x,y2 ,.......)

what does the subplot command do?

the subplot command causes multiple graphs to be graphed onto 1 figure

what is the format for the subplot command?

the format for the subplot command is: subplot(row #s, Colums #s, # of figures)

what is the syntax for a 3D plot in matlab?

plot3(x,y,z)

define CPU

central processing unit

define ALU

arithmetic logic unit

where does the processor send data that it is instructed to add?

the processor sends the values to the ALU then the ALU sends them back to the processor and then the processor sends those values to memory

what are utilities

utilities are programs in the operating system that allow you to perform functions like: printing, copying files from folder to folder and listing files in a folder

what is a kernal?

the kernal manages interface between the hardware and software, the kernal is part of the operating system

what is an assembly language?

an assembly language is a computer language written in symbolic statements instead of binary

what does the link/load step do?

the link/load step links machine language to the object program then loads the program into memory

what is software?

software are programs that describe the steps we want the computer to perform

where are instructions and data stored in a computer

the memory

what is hardware?

hardware refers simply to computer equiptment

what is source code?

source code is a set of instruction in computer language that solve a specific problem

what is object code?

object code is the result of compilation on the source code

what are compilers and computer software also known as?

system software

can variable names start with an underscore in matlab?

what does the isvarname command do in matlab?

returns 1 if its a valid variable name returns 0 if its an invalid variable name

MATLAB stands for?

matrix laboratory

Which command is used to clear a command window?

clc

To determine whether an input is MATLAB keyword, command is?

iskeyword

Command used to display the value of variable x. a) displayx

disp(x)

Command is used to save command window text to file.

diary

To stop the execution of a MATLAB command, used keys?

ctrl+c

Which is the invalid variable name in MATLAB?