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# Aleem Andrew

Last seen: 6 meses ago Active since 2020

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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...

6 meses ago | 1 answer | 0

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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...

9 meses ago | 1 answer | 0

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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...

9 meses ago | 1 answer | 0

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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...

9 meses ago | 1 answer | 0

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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...

9 meses ago | 1 answer | 0

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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)/...

10 meses ago | 1 answer | 0

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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...

10 meses ago | 1 answer | 0

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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...

10 meses ago | 1 answer | 0

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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 ...

10 meses ago | 1 answer | 0

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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...

10 meses ago | 1 answer | 0

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Question

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...

10 meses ago | 2 answers | 0

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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...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 2 answers | 0

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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. ...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 1 answer | 0

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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(...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 0 answers | 1

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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 ...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 0 answers | 0

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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...

más de 1 año ago | 1 answer | 0

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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...

más de 1 año ago | 1 answer | 0

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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 ...

más de 1 año ago | 1 answer | 0

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Finding the magnitude of an expression
Supposing that x can be expressed as a function of t as follows how can its magnitude be found using Matlab? For example, is the...

más de 1 año ago | 1 answer | 0