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**Content Feed**

Add x=y line to the scatter plot

x = linspace(300,600,2); y = x; plot(x,y) And you will need a hold command after the scatter command.

23 Tage ago | 0

Find the difference between two numbers in an array and create a new array

d_theta=diff(theta);

23 Tage ago | 0

| accepted

Discretise a domain into a grid of uniform volume size

Why is linspace not helpful? x1 = linspace(0,1,M); x2 = linspace(0,1,M); [X1,X2] = ndgrid(x1,x2);

23 Tage ago | 0

Question

Scientific description of cubic spline (interpolation)

Dear all, I am writing a scientific article (quantitative economics), and I need to describe the 'spline' method (cubic spline ...

23 Tage ago | 0 answers | 0

### 0

answershow can i save the even index to a matrix 2:5 using for loop

I think you want something like this: (which you could speed up by pre-allocating MAT=NaN(2,5)) cnt_rows = 0; cnt_cols = 0;...

26 Tage ago | 1

Question

mldivide versus least squares: X\(eye(m)) versus ( (X'X)\eye(m))*X'

Dear all, I am fitting a polynomial to data. I construct a polynomial basis X. I use some algorithm to update Y. I could use t...

26 Tage ago | 1 answer | 0

### 1

answerPlease help me convert equation to matlab code

[0 0 0;1 2 3] is an example of a matrix i Matlab. Please try the rest yourself. We are not here to do your homework. If you gav...

etwa ein Monat ago | 0

Error in fmincon (line 568) initVals.f = feval(funfcn{3},X,varargin{:})

As the error says there is no function P_model_main. You also only provided coded with a function called P_model. And please don...

etwa ein Monat ago | 2

Changing color of plot

The problem is that you plot only 1 point at a time. So there is no line to plot, just a point. That's why your code doesn't wor...

etwa ein Monat ago | 0

How to evaluate parameters in sum() of handle functions with fminsearch

Take a look at this. I hope it helps. x_exp=rand(1,10); %just to define the known vectors y_exp=rand(1,10); n=3; g=rand(1,n)...

etwa ein Monat ago | 1

| accepted

Plot the slope of a parabola with only the data points being known

clc; clear all; close all; x = linspace(-0.5,0.5,25); %length in (meters) def_3mm_no_grav = -[0.00 5.82e-1 1.08 1.53 1.94 ...

etwa ein Monat ago | 0

How do I plot if I have a lot of data on the x-axis and I want to see the whole line properly in app designer?

It is not clear what you mean with "How can I see all the lines correctly?" I'm sure the lines are correct, but your input is n...

2 Monate ago | 0

I can't figure out how to define X in a piecewise function to create a Bending Moment Diagram

The script of your professor is actually the function. Save it and you can call the function. function handle: myfun = @(x)mom...

2 Monate ago | 1

fsolve, fmincon producing different results

I believe fmincon could also be stuck in a local minimum, due to the quadratic terms. This solution might not actually solve the...

2 Monate ago | 0

how to retrieve a table from a cell array?

NEver used table but i think this will work: X = results{1,2}{1,1}; MyDates = X.Date; Might even work directly: MyDates = ...

2 Monate ago | 0

Issue with numerical integration of two variable function

You created only function handles. So f(x,y) = ..... To compute the numerical value you need to assign numerical values to x an...

2 Monate ago | 0

Index in position 2 exceeds array bounds (must not exceed 2). Error in fun1 (line 5)

You calculate: for i=1:N for j=1:D pos(i,j)=lb(j)+rand*(ub(j)-lb(j)); end end with D= 2, so pos is a...

2 Monate ago | 0

How to Solve matrix equations in Matlab

Your method seems valid. But of course fsolve will only attempt to find a local solution, and it might get stuck in a place wher...

2 Monate ago | 1

Index exceeds the number of array elements

The argument in brackets should be an index number, so for example: x = 1:10; %a 1 x 10 vector for ix = 1:size(x,2); f(ix) = ...

2 Monate ago | 0

| accepted

How to put fsolve in a loop, using 2 unknowns?

Replace the first line with: H = @(X)fsolve_root_finding(X(1),X(2));

5 Monate ago | 0

Need to apply trapezoidal rule for double integration with an array by using the for loop

There are two things that need correction: 1) Remove the line i=i+1. This is what the for loop does. (also don't use "i" in ge...

5 Monate ago | 0

Error in find Precision recall curve

Try without the quotations: [XCrit,tpr,YCrit,ppv] = perfcurve(Y,diffscore1,'HandGrip'); In general quotations are used to sp...

5 Monate ago | 0

| accepted

I am solving a nonlinear Model predictive control problem . I get the following error. Can anybody help me understand the error report?

The error says that the derivative at the initial point (x0) is either NaN, infinity, or complex. So you should check whether th...

5 Monate ago | 0

| accepted

time series interpolation of irregular data

You can use "griddedInterpolant". I would use 'pchip' as method.

5 Monate ago | 0

Multiple sample values into scatteredInterpolant

What works is: Make a 3D array from B, so: for ih=1:length(B) B_3D(:,:,id) = B{ib) end And then add a vector 'h...

8 Monate ago | 0

x undefined (Catenary Cable Case Study)

What you have done is programmed a function. So this function calculates fval when you give a value of x. You can now call this...

9 Monate ago | 1

| accepted

Locating point on x-axis where the slope is decreasing

Bascially you want to get the index when the change in theta becomes negative: dtheta = diff(theta); index = find(dtheta<0,1...

9 Monate ago | 0

Conversion to logical from sym is not possible.

g = 3; eff1=@(rr)-(1.8-0.8.*(1+rr)./(1-7.56.*g*rr))*rr/(0.01-0.11.*rr+0.06.*exp(23*rr)); x=fminbnd(eff1,-1,1); You could s...

9 Monate ago | 0

Hourly averages over a 20yr time series

Its not exactly clear over which values you want to calculate the mean, but have a look at this function, that can calculate mov...

9 Monate ago | 0

Removing/clearing NaN/0 values from matrix/array data

A1 = A(A~=0 & B~=0) should work

9 Monate ago | 0