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PEC

Last seen: 4 dagen ago | Active since 2017

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MATLAB enthusiast , Mechanical engineer (MeMe) :-)

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readtable struggling to interpret spreadsheet as numbers
seriesAL = rows2vars(readtable('Alberta.csv', ReadRowNames=1, MissingRule="omitrow",VariableNamingRule='preserve')) yy = strrep...

19 dagen ago | 0

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Hi, I am having some trouble with a plot. I am trying to plot pressure vs. time using an equation for pressure with respect to time. Whenever I plot this I get a blank graph, so i'm not sure what the problem is. I appreciate any help!
@Sarah Fries Try using the vpasolve function and solve the equation for well defined input time interval. In your code, you we...

19 dagen ago | 0

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I didn't understand it how they completed it?
@Mohit Define the symbolic variables d & theta for the given equation to be solved % syms d theta x = [d theta]; % defin...

21 dagen ago | 0

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Workspace variable not available despite visibility in another variable
if you want to store the variable names Testsignal_1 and Current then you need to use an indexing variable as below. If this c...

26 dagen ago | 0

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Adding Legend to Subplot
@Ollie Bardsley, you need to rearrange the few lines of code inside the for loop as shown below LF = ["0 1.fig","0 2.fig","1...

ongeveer een maand ago | 0

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Matrix indexing with two vectors of indices
Given a matrix M and two index vectors a and b, return a row vector x where x(i) = M(a(i),b(i)).

ongeveer een maand ago

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Reverse Run-Length Encoder
Given a "counting sequence" vector x, construct the original sequence y. A counting sequence is formed by "counting" the entrie...

ongeveer een maand ago

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How can I write a 'for' loop that sums up all elements of a vector?
@Seif do you mean like this ? a= [1:5] for i=1:3 c(i)=sum(a(i)+a(i+1)) disp(sum(c)) end

ongeveer een maand ago | 0

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Legend colors change when I have two y axes
colors=["#028A0F","#1D57A9","#3DCBC8","#9C58A1","#F0D04D","#CD0027","#EF9F26","#B2B3B5","#FA9DAC","#98FF98","#67032F","#010101"]...

ongeveer een maand ago | 0

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How to make the negative sign of y axis to be up ?
ydata = -900:100:100 xdata = ydata.*ones(1,length(ydata)) plot(xdata,ydata) yticks = ydata; yticklabels(fliplr(yticks))

ongeveer een maand ago | 0

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Acidity of vinegar and salts
Assuming: pH (potentia hydrogenii) = - log10(H+ ionic concentration in mol/Liter). For a buffer solution containing acetic acid ...

3 maanden ago

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Volume of this donut
Given hole diameter a, and outermost diameter b, determine the volume y of the resulting donut.

3 maanden ago

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Size of this cup?
The given vector has diameter of the cup in mm sampled at micrometer increments in depth from top to bottom, need output in cc a...

3 maanden ago

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Finding perimeter of a rectangle
A rectangle has a length of x centimeters and a width of w centimeters. Find the perimeter.

3 maanden ago

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area of an annulus
Given the diameter d of the inner circle of the annulus. Given length z of a chord of the outer circle of the annulus. This chor...

3 maanden ago

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expand intervals vol.2
Similar to problem <http://www.mathworks.co.uk/matlabcentral/cody/problems/2528 2528>. This is a more general case, when bounds ...

3 maanden ago

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Time Expansion
How can you slow down any discrete-time signal? Example Input original signal x. x = [1 2 3 -1 -2 -5 -4] We want t...

3 maanden ago

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Incorrect dimensions for matrix multiplication
k = @(t,u) (k0 + (p*k0.^u-q*k0).*t +(p*k0.^u-q*k0).*(p*u*k0.^u-q).*t.^2/factorial(2)... +(p*k0.^u-q*k0).*((p*u.*k0.^u-q)....

3 maanden ago | 0

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how to get variable of function in for loop
x = 1:20; y = 1:13; f = []; for i = 1:length(x), for j = 1:length(y); f(i,j) = x(i).^2 - x(i) -2*y(j).^2 + y(j) -2...

3 maanden ago | 0

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Convert Kilometers to Miles
Convert kilometers to miles. Consider 1 km = 0.62 mile. Note: Don't use the '*' operator.

3 maanden ago

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Create an anti-identity matrix
Create an anti-identity matrix of given dimension. Examples n = 2 A = [0 1; 1 0] n = 3 A = [0 0 1; 0 1 0; 1 0 0...

3 maanden ago

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Sort the vector with the given index
Given x = [1 2 4 8 17] and t = [1 3 2 5 4] then y = [1 4 2 17 8].

3 maanden ago

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middleAsColumn: Return all but first and last element as a column vector
Given input A, return all but the first and last elements, arranged as a column vector. (I.e., all dimensions after the first s...

3 maanden ago

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What number has this problem?
This problem is added because it is problem number *???* in the "Community" problems section. <http://www.mathworks.de/matlab...

3 maanden ago

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Back to basics 9 - Indexed References
Covering some basic topics I haven't seen elsewhere on Cody. Given an input matrix and row and column, output the index of th...

3 maanden ago

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Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

3 maanden ago

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Switch matrix to a column vector
for e.g. x = [1 2 3 4] y = 1 3 2 4

3 maanden ago

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Generate a NaN...on purpose
The goal is to create a function that will return a single "NaN" without using the nan function. I am interested to see how many...

3 maanden ago

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Convert yards to feet
The goal of this script is to convert a value given in yards to feet.

3 maanden ago

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Find the sum of n squares
What is the sum of the squares of the first n integers?

3 maanden ago

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