# Askic V

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**Content Feed**

ode45 returns a vector of length 0

I see few problems. First have a look at this suggestion: Coefficient alfa is huge, so change in tempearture is very fast, ther...

6 hours ago | 1

| accepted

Str2double gives NaN

I would also like to suggest this solution: X = "3.716,3.711,3.719,3.714,3.714,3.711,3.722,3.712,3.715,3.715,3.717,3.721,3.713,...

1 day ago | 1

Str2double gives NaN

Try this: X = "3.716,3.711,3.719,3.714,3.714,3.711,3.722,3.712,3.715,3.715,3.717,3.721,3.713,3.714,0.000"; newStr = split(X,',...

1 day ago | 2

How to find first 10 minimum values in a table array?

Another solution is to use readcell function instead of read table. T = readcell('https://in.mathworks.com/matlabcentral/ans...

1 day ago | 0

Why do I get "Array indices must be positive integers or logical values" error?

You asked why, and the answer is because of this line: Vc=x(y+z-u-rr) here, x is considered an array and y+z-u-rr is an index....

1 day ago | 0

how can we decreases the length of the quiver? so that the tail get smaller but head shouldn't move.

I would do with a different approcah to have more fexibility and control over how vectors would look like. Here is a sample cod...

4 days ago | 0

I want to find out how to get the angles between the centroids

Hello Don, I think you might find this example useful: close all clc clear P1 = [231; 84]; P2 = [297; 284]; P3 = [544; 25...

5 days ago | 1

How to write this thetta fuction in Matlab? I have an example code in Python

Ok, without going into too much details, let's say you have the following Python functions that you need to rewrite in Matlab. ...

5 days ago | 1

| accepted

Euler Method for vector function

It appears to me that you want this: clear clc close all % step size h = 0.1; % final time Tf = 5; x = 0:h:Tf; yexact...

5 days ago | 0

Matlab Code to calculate total energy consumed in given time.

Energy is just an integral of power over time. You can use cumtrapz function. This is probably what you need: A = xlsread('X_F...

6 days ago | 1

| accepted

Basic Matlab to python question

This is what you probably want: import numpy as np arr = np.array([1, 2, 3, 4, 5]) arr2 = np.arange(0,10,2) print(arr) ...

6 days ago | 0

Unexpected output from simplify()

It is probably because you he a division by vc in your expression. .../(vc^2)... This means simplified expression is valid onl...

6 days ago | 0

| accepted

How to change element position in matrix?

Please use Matlab built in function called: circshift for example: A=[1;1;0;0;1;0;1] B = circshift(A, [-1, -1])

7 days ago | 0

| accepted

How to rotate a vector

If you want to reverse elements, then just use flip function. v = 1:10 v_f = flip(v)

8 days ago | 1

| accepted

How to name axes from the script

I would do ike this: x = linspace(0, 50); y = sin(x); plot(x,y); input_x = input('Enter name for x label:','s'); input_y = ...

8 days ago | 1

| accepted

Calculate number appearance within a range

Perhaps this code snippet will help you: load TT classes = [1 2 10 20 50 100]; tol = 1e-10; res = zeros(size(diff(classes)...

12 days ago | 0

How to remove all for-loops with vectorization?

This code should give you a pretty good idea how to do this: clear clc u=[35 75 -35 -75 0.3 0.5]; b=u; K=length(u)/3;% C...

13 days ago | 0

| accepted

Defining and plotting a piecewise function of irregular interval

You can try something like this: syms x %makes x a symbolic variable f = piecewise(x>=0 & x<1/4, 1, x>=1/4 & x<1/2, 4*x.^2, x>...

13 days ago | 0

| accepted

How do I create a function, save it, then run feral on it?

I understand this is homework, but you need to know that feval is not really necessary. Evan matlab suggest that. You can use t...

13 days ago | 1

| accepted

HOW to convert negative integer to bit in Matlab?

Wel, you can use something like this (assuming you're working strictly with integers): s = -10 b = dec2bin(typecast(int8(s),'u...

25 days ago | 0

Depth first search algorithm

Use built in function: https://www.mathworks.com/help/matlab/ref/graph.dfsearch.html

1 month ago | 1

2 axis plot with different markers connected with lines

If you want to have legend only on points 'o' in both red and blue lines, I would do this: %plotting % I want to plot two axi...

1 month ago | 0

Need to implement a bandpass filter on the ECG signal using matlab

Please have a look at the file exchange. For example: https://www.mathworks.com/matlabcentral/fileexchange/49822-open_ecg-ecg...

1 month ago | 0

2 axis plot with different markers connected with lines

I would do somthing like this: %plotting % I want to plot two axis with different markers for lambda_r (hollow marker)and alp...

1 month ago | 0

| accepted

Function inside a for loop

For loop will be executed in a matter of milliseconds. On the other hand when you call function once at a time, there is a signi...

2 months ago | 1

| accepted

Precision and indices must be positive integers

The problem is in the line: kd = (Ppeak-0)/(times(end) - t); times is a built in Matlab function for element wise multiplicat...

2 months ago | 0

What is wrong with my code?

In the line inside the function: term(k) = pi/(12+ k^b); but you didn't send b as an input parameter nor did you define it ins...

2 months ago | 0

| accepted

I can not use i j k as a sym type what should I do

This is how I would solve this problem: c1 = test() function c1 = test() syms x y z k real i = sym('i'); j = sy...

2 months ago | 0

Is this proper use of backward difference approxiamation?

The difference can be best seen on an example: h = 0.1; x = 0:h:6; F = sin(x); x_fw = x(1:end-1); dF_fw=(F(2:end)-F(1:end...

2 months ago | 0

How to take first and second order derivative of discrete data?

Hello Ying, you wrote that second derivative of signal 2 looks weird. I assume that is ddCl (also based on how plot looks like)...

2 months ago | 0

| accepted