Reverse calculate a table of values
I am not certain what a ‘3D table’ is. Perhaps you intend a three column table or array. If that is true, then the interp1 f...

5 days ago | 1

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Sequence a_n =1/n
Use element-wise division: n = 1:100; format short Seq = 1./n producing: Seq = 1.0000 0.5000 0.3333 0.2500 ...

5 days ago | 1

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Calculate area under curve of multiple peaks
Using cumtrapz: [peaks,loc]=findpeaks(crestbar, 'MinPeakProminence', 30); [trofs,troflocs] = findpeaks(-crestbar, 'MinPeakPro...

5 days ago | 0

We need to install Global Optimization Tool
Try running these lines from a script or your Command Window first: restoredefaultpath rehash toolboxcache That may fix th...

5 days ago | 0

convert plot3 to contour plot
Use the griddata function: a = randi(9, 10, 3); x = a(:,1); y = a(:,2); z = a(:,3); xv = linspace(min(x), max(x), 6); ...

5 days ago | 0

Index exceeds matrix dimensions error "for my code"
It is unfortunate that we do not get the opportunity to see what ‘X’ is for the various files, nor anything else about them. ...

5 days ago | 0

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this is a part of my test and i cant find the mistake in this .
The obvious observation is that ‘x’ is going to be less than 10 from the initial iteration through how many iterations it takes ...

6 days ago | 0

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Error in saveas, Invalid figure handle
I cannot run your code because I do not have the necessary files. However: %% Let's plot T and RH times...

6 days ago | 0

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Custom colour bar, excluding the Blue from RGB.
Define ‘CustomColourMap’ as: CustomColourMap = @(x) [linspace(0,1,x).' linspace(1,0,x).' zeros(x,1)]; then to use it: Cust...

6 days ago | 0

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how to make fuction from changing varibles
That is relatively straightforward to do with ndgrid or meshgrid. Try this hypothetical example: Z = @(x,y,z) x.^2 + y.^2 +...

6 days ago | 0

Add 0.5 *0.5 degree grid on figure (country)
This illustrates the general approach: x = linspace(44, 64); y = linspace(25, 40); t = linspace(0,2*pi); circx = 0.25*(ma...

6 days ago | 0

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How can i plot with if statement ?
Try this: x=[10 20 30 40 50 ] ; for k = 1:numel(x) if x(k)==10 y(k)=((10*10^6)*.1523)./ x(k) ; end if...

6 days ago | 0

Make a Plot using loop
Subscript ‘Cp’ and the plot magically appears! Dg=150; %mg Vd=50; %L Ke=0.4; %h^-1 Ka=1.6; %h^-1 t=0:0.1:10; for k = 1...

6 days ago | 0

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titel for tables with spce between the words
The R2019b release allows spaces and other (inluuding Unicode) characters in table variable names. Upgrade to it and you will b...

6 days ago | 1

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How to change the size of error bar?
I am not certain what you want. Try this: errs = rand(1,10); x = 1:10; y = randi([10 20],1,10); figure plot(x, y) ho...

7 days ago | 1

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Ending a recursive function
I have not run your posted code, however two things are immediately apoparent. First, in the calls to ‘mysequence’, the fun...

7 days ago | 0

Relational operator == doesn't work properly in some cases!
You are seeing the effects of floating-point approximation error. See for example: Why is 0.3 - 0.2 - 0.1 (or similar) not e...

7 days ago | 0

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C.T. signals convolution in Matlab
One approach: syms h(t) x(t) s t Fcn1 = h(t) == exp(-2*t)*4 - 4*exp(-t); Fcn2 = x(t) == heaviside(t); convlap = laplace(Fc...

7 days ago | 0

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how can i Solve this equation With ode45
Try this: syms y(t) w T Y DE = diff(y,2) + w; [VF,Subs] = odeToVectorField(DE) ODEfcn = matlabFunction(VF, 'Vars',{T,Y,w})...

7 days ago | 0

Problem using function fsolve
Use a different initial parameter estimate vector. Try this: z0 = rand(3,1); Your code divides the parameters by each othe...

7 days ago | 0

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Creating a 3d plot of the solutions to an ODE as the time a switch condition activates varies
I am not certain what you want to do. Try this: function L2_ode45 tspan = linspace(0, 500, 50); t1 = 100:100:500;...

7 days ago | 1

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Replacing NaN with last real value
If you have R2016b or later releases, use the fillmissing function. I am not certain what you want to do, so see the method a...

7 days ago | 0

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Peak value on plot graph
If you have R2017b or later, you can use the islocalmax function. If you have the Signal Processing Toolbox, you can use the ...

7 days ago | 0

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Finding the percentage of NaN cells in columns
This does everything for all the tables in ‘C’: D = load('C.mat'); C = D.C; for k = 1:numel(C) C{k}(:,1:4) = fillmissin...

7 days ago | 1

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Import correct date and time from different columns in Excel
Try this: In = readtable('Airport 2019 (1.5-30.9).xlsx', 'PreserveVariableNames',1); hrmnsc = datetime(compose('%04d\n',In.Ti...

8 days ago | 0

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where are my data?
Try this: F = openfig('untitled.fig'); ax = gca; lines = findobj(ax, 'Type','Line'); for k = 1:numel(lines) x{k,:} = l...

8 days ago | 1

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ODE45 Unable to perform assignment because the left and right sides have a different number of element
The problem is ‘G’. Since it is a vector, all computations involving it are going to be arrays. You can use it, however in e...

8 days ago | 0

Solve system of differential equations with vector input
In the derivation, let ‘a’ simply be an undefined constant, and define the initial conditions as 0 (unless you want them to be s...

8 days ago | 0

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