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# CAM

242 total contributions since 2012

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Question

Simultaneous reading of mat file allowed?
I know it is bad to allow multiple users to write to a mat-file simultaneously (or one read while another is writing). But can ...

13 days ago | 0 answers | 0

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answers

Solved

Reindex a vector
You are given two vectors of equal length. Vector N has numeric values (no Inf or NaN) while vector IDX has integers. Place th...

13 days ago

Solved

Specific Element Count
Given a vector _v_ and a element _e_, return the number of occurrences of _e_ in _v_. Note: NaNs are equal and there may be n...

13 days ago

Answered
Cell array data to double conversion
Assuming each cell has only one entry, try using cellfun with str2double to convert the cell array of strings to a cell array of...

1 month ago | 0

| accepted

Solved

Find the peak 3n+1 sequence value
A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...

1 month ago

Solved

Read a column of numbers and interpolate missing data
Given an input cell array of strings s, pick out the second column and turn it into a row vector of data. Missing data will be i...

1 month ago

Solved

Get the area codes from a list of phone numbers
Given a string of text with phone numbers in it, return a unique'd cell array of strings that are the area codes. s = '508-6...

1 month ago

Answered
i keep getting an error in my code about my array. pls help . code and error below thank you
When you are concatenating horizontally, the number of rows must be consistent. According to your comment, all variables are 1x...

2 months ago | 0

Solved

Return unique values without sorting
If the input vector A is [42 1 1], the output value B must be the unique values [42 1] The *values of B are in the s...

2 months ago

Solved

Divide by 4
Given the variable x as your input, divide it by four and put the result in y.

2 months ago

Solved

Try 1.5.4: Celsius to Fahrenheit
Write a program to convert an input given in Celsius to Fahrenheit. Examples: Input celsiusValue = 100 Output fahrValu...

2 months ago

Solved

Fibonacci Decomposition
Every positive integer has a unique decomposition into nonconsecutive Fibonacci numbers f1+f2+ ... Given a positive integer n, r...

2 months ago

Answered
Need for explication of this code
"i" starts with 1. M becomes [V(1:(1+3))] = [1:4] = [1 2 3 4]. "i" becomes 5 = (1+J) = (1+4). M adds a row with [5 6 7 8]. Et...

2 months ago | 1

| accepted

Answered
How to create a GUI with changing buttons?
Another possibility is to use the same set of buttons for both options, but assign associated properties (String label) within t...

2 months ago | 0

Solved

Project Euler: Problem 2, Sum of even Fibonacci
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 te...

2 months ago

Solved

Getting logical indexes
This is a basic MATLAB operation. It is for instructional purposes. --- Logical indexing works like this. thresh = 4...

2 months ago

Answered
I can not modify data in a table
Have you considered using appdata instead of guidata? In this matlab answer (Appdata answer with link), there is a link to a gr...

2 months ago | 0

Solved

Remove the two elements next to NaN value
The aim is to *remove the two elements next to NaN values* inside a vector. For example: x = [6 10 5 8 9 NaN 23 9 7 3 21 ...

2 months ago

Solved

Create a "+" flag
Given two odd numbers, [m, n], return a matrix of size m x n which has all elements of the centre column and centre row set as 1...

2 months ago

Answered
Script for deleting extra rows
Try this to remove rows with blank Depths: [~,~,dataIn] = xlsread(fileName, worksheetName); index = ~cellfun(@isempty, dataIn(...

2 months ago | 0

| accepted

Solved

How many Fibonacci numbers?
Find the number of unique Fibonacci numbers (don't count repeats) in a vector of positive integers. Example: x = [1 2 3 4...

3 months ago

Solved

Number of Even Elements in Fibonacci Sequence
Find how many even Fibonacci numbers are available in the first d numbers. Consider the following first 14 numbers 1 1 2...

3 months ago

Solved

Fibonacci-Sum of Squares
Given the Fibonacci sequence defined by the following recursive relation, * F(n) = F(n-1) + F(n-2) * where F(1) = 1 and F(1)...

3 months ago

Solved

Getting the indices from a matrice
Getting the indices from a matrice. Inspired by Problem 645. Getting the indices from a vector by the great Doug Hull. Given a...

3 months ago

Solved

First non-zero element in each column
For a given matrix, calculate the index of the first non-zero element in each column. Assuming a column with all elements zero ...

3 months ago

Solved

Replicate elements in vectors
Replicate each element of a row vector (with NaN) a constant number of times. Examples n=2, A=[1 2 3] -> [1 1 2 2 3 3] ...

3 months ago

Answered
Error with xlswrite (error 0x800A03EC)
Try xlsprotect from File Exchange. https://www.mathworks.com/matlabcentral/fileexchange/6046-xlsprotect It has worked well for...

3 months ago | 0

Answered
2019b installation problem
I had this same problem with 2018b and now again with 2019b. Last year, Matlab Support solved it with the following solution: ...

3 months ago | 11

Solved

Fill a zeros matrix
The aim is to fill an array of all zeros given a numerical value and the index of row and columns for this value. 3 Inputs: ...

3 months ago

Solved

Generate N equally spaced intervals between -L and L
Given N and L, return a list of numbers (in ascending order) that divides the interval [-L L] into N equal-length segments. F...

3 months ago

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