# Aleem Andrew

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**Content Feed**

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Solving algebraic equations without using symbolic variables

How do you solve an algebraic equation like x+y=2 for x without using symbolic variables - for example by defining a function ha...

2 years ago | 1 answer | 0

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answerQuestion

Reading an Excel table with both numbers and text

I read an Excel table using the readtable function. I wanted to refer to specific values, whether text or numbers, but when I tr...

2 years ago | 1 answer | 0

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answerQuestion

Updating values in a matrix when corresponding variable values are updated

In the code below, when a, a variable in matrix w, is updated the matrix does not automatically update. Is there a way to update...

2 years ago | 1 answer | 0

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answerQuestion

Aligning numbers with text in a table

In the code below, the numbers all occupy 13 characters of space. How do you align the words and numbers so each word also occup...

2 years ago | 1 answer | 0

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answerQuestion

Keeping track of order of rows when sorting a matrix

I am trying to sort the matrix B below and also keep track of the order in which rows get swapped. B = [100000001 0100001...

2 years ago | 1 answer | 0

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answerQuestion

Input argument for ode45 function type error

I am trying to modify the following code. tspan = [0 10]; x0 = 0; [t,x] = ode45(@(t,x) (-4.76e+1*x^2 + 5.69e-9*x + 7.98e-2)/...

2 years ago | 1 answer | 0

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answerQuestion

Simplifying output in Matlab

If you get an expression like this as output syms x fx = -(1.0*(1.82e+39*x^2 + 1.81e+32*x - 3.04e+39))/(6.35e+41*x + 4.27e+3...

2 years ago | 1 answer | 0

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answerQuestion

Using numerical methods to plot solution to first-order nonlinear differential equation

I have a question about plotting x(t), the solution to the following differential equation knowing that dx/dt equals the express...

2 years ago | 1 answer | 0

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answerQuestion

Finding roots of symbolic expression

You cannot directly use the roots function to find the roots of a symbolic expression. syms x fx = x^2 + 2*x + 1 How do you ...

2 years ago | 1 answer | 0

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answerQuestion

Merging row elements into single numbers

If you have the 3*3 matrix C = [3 4 5 6 7 9 1 5 8] and you want to change it to the 3*1 matrix C = [345 679...

2 years ago | 1 answer | 0

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answerQuestion

Merging rows of a matrix into a number

If you have the 3*1 matrix C = [345 679 158] and you want to change it to the 3*3 matrix (or vice versa) C = [3 4...

2 years ago | 2 answers | 0

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answersQuestion

Output of Deconv function Matlab

When you type the command deconv([1 -3 -52],[1 -4]) the answer is 1 1 which I did not expect since (x+1)(x-4) is not (x^2-3x...

3 years ago | 1 answer | 0

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answerQuestion

Inconsistency of angle function in finding angle of vectors

Typing the command angle(1+i) yields an angle of 45 degrees, but typing angle(-1-2i) yields -2.0344. Why is the angle being meas...

3 years ago | 2 answers | 0

### 2

answersQuestion

Plotting responses other than step responses to transfer function

I am trying to plot the response of a transfer function to an arbitrary input. The step response can be plotted as shown below. ...

3 years ago | 1 answer | 0

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answerQuestion

Find range of values of independent variable so the dependent variable is in a certain range

Given a function for example f(x) = x^3+x^5 is there a way you can determine all values of x such that the absolute value of f(x...

3 years ago | 1 answer | 0

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answerQuestion

Finding the ramp response to a transfer function

If T is the transfer function defined below, how do you find the ramp response? G = tf(poly([-2 -3]),poly([0 -1])); T=feedback(...

3 years ago | 1 answer | 0

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answerQuestion

More accurate alternative to rlocfind to analyze root locus in control systems engineering

To find the gain at the point where the root locus intersects a line of constant damping ratio, the rlocfind function can be use...

3 years ago | 2 answers | 1

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answersQuestion

Using deconv to divide vectors if the numerator has a smaller degree than the denominator

When using deconv to divide two vectors the output is 0 if the numerator has a smaller degree than the denominator. Can you get ...

3 years ago | 1 answer | 0

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answerQuestion

Dividing two vectors of different sizes

If you have two vectors a = [1 2 1]; b = [1 1] that represent polynomials can you divide a by b to get [1 1] as the answer, sinc...

3 years ago | 1 answer | 0

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answerQuestion

Convert a structure array to a list

I am trying to convert a structure array into a list rather than a cell to be able to perform operations such as finding the inv...

3 years ago | 1 answer | 0

### 1

answerQuestion

Unable to convert expression containing symbolic variables into double array error

I am trying to define a vector xdd in terms of another vector x but when I define elements of the vector xdd in terms of the cor...

3 years ago | 1 answer | 0

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answerQuestion

Finding inverse Laplace when the inverse Laplace function is a piecewise function

I wrote the following Matlab program to find x in the time domain. syms y(t) m k x c w F s eqn = s^2*x-s+2*s*x-2+2*x == exp...

3 years ago | 1 answer | 0

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answerQuestion

Displaying a group of vectors on separate lines

I am trying to display a number of vectors in separate lines. How can you create a matrix with each its rows equal to one a grou...

3 years ago | 1 answer | 0

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answerQuestion

Solve for a variable in terms of specific other variables

The derivative of eq1 below is diff(x(t), t) == diff(y(t), t). I am trying to use the solve function to solve for diff(y(t)) and...

3 years ago | 1 answer | 0

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answerQuestion

Solving differential equations and specifying initial conditions

Given an equation, can you solve for the derivatives of certain quantities in terms of the other variables? For example in the f...

3 years ago | 0 answers | 0

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answersQuestion

Check for missing argument or incorrect argument data type in call to function 'solve'. error

I am trying to solve for a variable using the solve command. I know I can do so symbollically, but I want to first intiailize th...

3 years ago | 1 answer | 0

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answerQuestion

Finding a closed form solution of nonlinear differential equation

Can you find an expression for x, which is a function of t, given that sin(x*t) + t^2*cos(3*t^2)+x''(t) = 5x (x''(t) is the seco...

3 years ago | 1 answer | 0

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answerQuestion

Plotting path traced by a point in an animation

The following code creates an animation of a four bar linkage. Can someone explain how you can modify the code to plot the path ...

3 years ago | 1 answer | 0