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HOW TO CODE AND PLOT EQUATION
You are missing multiplication operator between 'k' and t^n. MR = a*exp(-k*(t^n))+b*t

3 years 前 | 0

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least square fitting with a data set
You can use sgolayfilt() or 'smoothingspline' option from curve fitting toolbox. See the answers here for detailed discussion on...

3 years 前 | 0

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Coding bug - IF statement
Comparing arrays like this does not work properly with the if-else block. See the output of your comparison >> a=[1;0;0] b=[0;...

3 years 前 | 1

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How to plot the opposite direction field
Try this quiver(x, y, 1./u, 1./v);

3 years 前 | 0

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Plotting third order differential equation using ode45
You need to convert this 3-rd order ODE to 3 first order ODEs. Also due to +-1, you have two systems of ODEs. Try following code...

3 years 前 | 0

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using fzero with arrayfun searching for zeros inside an interval
Create a cell array and then use cellfun() f = @(x) -x.^2+4; C = {[-3 1.9]; [1.95 3]}; sol = cellfun(@(x) fzero(f, x), C)

3 years 前 | 1

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2D colormap of a polar coordinates function
You will need to use x = -2:0.02:2; [x,y] = meshgrid(x); a1 = 5; r2 = x.^2+y.^2; I = a1 * exp(-5*r2); surf(x,y,I); shad...

3 years 前 | 2

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How can i get the index of all matrix value
Are you looking for something like this A; B = repmat((1:size(A,1)).', 1, size(A,2))

3 years 前 | 0

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Plot transfer function with exponential function
An alternative approach: s = tf('s'); G = 4*exp(-s)/(s^2+4*s+4); step(G)

3 years 前 | 2

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determine the values of 2 unknowns through nonlinear regression and predict value of equation
There are several ways to do nonlinear regression for a given model in MATLAB. If you have the optimization toolbox, then you ca...

3 years 前 | 0

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How to plot function with conditions (3d)
You can replace the unwanted values with nan. [x,y] = meshgrid (-2:2:2); z = x.*y; mask = x + y <= 1; z(~mask) = nan; surf...

3 years 前 | 0

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I'm trying to plot differential equations but it's showing errors.
You are not applying the initial condition with solving the ode. Check the following code clc close all syms i(t) di = diff(...

3 years 前 | 0

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How could I plot a 3D surface response for 3 independent variables and one dependent variable
First, you need to convert your list of scattered points into a 3D grid using interpolation: https://www.mathworks.com/help/matl...

3 years 前 | 0

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Curve fit or spline fit for a wavy function
Use interp1(): https://www.mathworks.com/help/matlab/ref/interp1.html with 'spline' interpolation method.

3 years 前 | 0

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fitlm works but polyfit does not work
There is probably NaN somewhere in your dataset. fitlm() ignores those data values. For example x = linspace(0, 1, 10); y = 2*...

3 years 前 | 0

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matrix for simulating 20 coin tosses
Try this M = randi([0 1], 20, 1000); M_sum = sum(M); freq = accumarray(M_sum(:), 1, [20 1]); bar(1:20, freq) xlabel('Numb...

3 years 前 | 0

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how to read images from matlab? matlab image processing
You can write a for-loop and save all the images in a cell array P = 'C:\Users\sy\Desktop\miasdbv1.21\MIASDBv1.21'; D = dir(fu...

3 years 前 | 1

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how can I convert comma with semicolan and then again point with comma for a multiple csv files?
Try this str = fileread('scope_0.csv'); str = replace(str, {',', '.'}, {';', ','}); f = fopen('outfile.csv', 'wt'); fprintf(...

3 years 前 | 0

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Convert a value into a Matlab syntax string
You can do something like this exStruct.value = [1 0 0;0 1 0;0 0 1]; out = ['[' strjoin(compose(repmat(' %d ',1,3), exStruct.v...

3 years 前 | 1

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How can I remove successive repeated numbers (column wise) from a matrix?
Easy peasy A = [11 35 57 45 94; 26 45 69 45 86; 58 45 39 96 35; 87 59 64 56 45] B = A(:); or B = reshape(A...

3 years 前 | 0

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Find a transfer function from plot data
The easiet option is to use the system identification app: https://www.mathworks.com/help/ident/ug/working-with-the-system-ident...

3 years 前 | 0

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Indexing between two lists
It seems that you can just use round() on the 3rd column, but since that solution is so obvious, there might be some other reaso...

3 years 前 | 0

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Error using symengine, Either base or exponent must be a scalar.
You are overwriting x and y inside the for-loop. The syntax for vpsaolve() is also incorrect. syms x y r = [3, 3.5, 4, 4.5, 5...

3 years 前 | 1

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Matlab ode solver - putting condition in function
The easiest option might be to do this after getting the solution from ode23s. For example [t, y] = ode23s(..) idx = find(y<...

3 years 前 | 0

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capture a snapshot and saving it to a matrix variable
Are you using it inside App designer? Remove the line clear all; clc; close all

3 years 前 | 1

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How can I transform a transfer function to a filter?
Filtering through a transfer function is equivalent to simulating the dynamic control system with an unfiltered signal at the in...

3 years 前 | 1

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Error using readcell ...Input must be a row vector of characters or string scalar.
This error is thrown inside the try-catch block. So we can't see what is causing the error, but the most common reason is that y...

3 years 前 | 0

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Please how to calculate the number of 1 and 0 in each position in a binary vector
Try this str = '00000001111000000000111111100000000000000011111111'; x = diff([0 find(diff(str-'0')) numel(str)]) Result >> ...

3 years 前 | 0

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Writing differential equation for plot
Try this syms x(t) d1x = diff(x); d2x = diff(x,2); ode = d2x == -sign(x + d1x); cond = [x(0)==1 d1x(0)==0] sol = dsolve(...

3 years 前 | 0

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How to store values of rows in a matrix where the 3rd column is a multiple of 100?
Use can use rem() to filter the rows where the third column is multiple of 100 and then use logical indexing M; % nx3 matrix i...

3 years 前 | 2

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