# Lessmann

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**Content Feed**

How to vectorize for loop of partial arrays?

Hi, this is a vectorized version of your loop. k = ones(1000,1); b = 10*rand(25,1); f = ones(25,1); a = 10*rand...

mer än 7 år ago | 0

How can I delete numbers in a matrix that is not equal to numbers in another matrix?

Hi, you can use logical indexing with the 'ismember' function: A= A(ismember(A,B))

mer än 7 år ago | 1

How can I calculate the product of elements in even positions in a vector using a for loop, without using sum or prod built-in functions?

Hi, you can use the modulo function to detect the even positions and then simply multiply the values. z = (50)*rand(1,100...

mer än 7 år ago | 0

Out of memory error with 8GB and 64bit

Hi, considering the mentioned size of a matrix, the matrix would occupy ~20GB or ~10GB in the case of single precision. With ...

mer än 7 år ago | 0

| accepted

Comparing more than two columns of a matrix using '<' or '>' symbol

Hi, you can achieve this by using B = diff(-A,1,2) < 0 You have to concatenate a column of zeros, so that A and B are ...

mer än 7 år ago | 0

If statement with 2 matrices

Hi, if statements on matrices can often be realized with logical indexing. Assuming the matrix B is of type 'logical', your ...

mer än 7 år ago | 0

| accepted

Why complex arrays take twice as much memory on GPU than on CPU ?

Hi, this behaviour is not a difference between CPU and GPU. It is the general case that the complex nuber uses twice the memo...

mer än 7 år ago | 0

Plotting data on a 2d plane with colorbar

Hi, an easy way of doing this is the scatter plot. Use it like this scatter(x,y,[],z,'filled') <</matlabcentral/answe...

mer än 7 år ago | 2

Solved

Sum the squares of numbers from 1 to n

For a given value of n return the sum of square of numbers from 1 to n. Example For n = 2 then sum of squares = 5 (1^2 + ...

mer än 7 år ago

In an assignment A(I) = B, the number of elements in B and I must be the same.

Hi, your problem is, that the dimensions of Rainfall and CN don't match. Use the the index idx or ~idx on CN. Also the operat...

mer än 7 år ago | 0

| accepted

Solved

Health app

A health app records a user's weight and displays the change in weight from the previous measurement to the next. Assign weightC...

mer än 7 år ago

Solved

Writing a while loop

Write a while loop that continues to increment userValue by 5 until userValue is less than 0.

mer än 7 år ago

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Preset rpm speeds

A centrifuge has four preset speeds. Write a switch statement that assigns rpmSetting with the appropriate rpm speed given prese...

mer än 7 år ago

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Vigenere cipher - be like Sherlock Holmes!

You're a young detective. Every detective needs a function to decrypt a vigenère cipher. It's a modification of a caesar cipher....

mer än 7 år ago

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Is my wife right

This is question relies on the dilemma that every married man faces in his life. Which has one simple ans: So whatever the qu...

mer än 7 år ago

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Calculate Simple Intrest for given data

P,N,R stands for Principle amount, No. of years and rate of intrest resp. Calculate intrest I

mer än 7 år ago

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Remove All elements less than 5

Given an input vector x, remove all elements of x less than 5 . Example: Input x = [ 1 2 5 7 3 ] Output y is [ 5 7 ...

mer än 7 år ago

How it is possible to sum these two matrix as a vector?

If I understand you right, this should do it. function [C1,C2] = foo(A,B) C1 = zeros(16,4); C2 = zeros(16,4); i...

mer än 7 år ago | 0

| accepted

Solved

What is the next step in Conway's Life?

Given a matrix A that represents the state of <http://en.wikipedia.org/wiki/Conway's_Game_of_Life Conway's game of Life> at one ...

mer än 7 år ago

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Interpolator

You have a two vectors, a and b. They are monotonic and the same length. Given a value, va, where va is between a(1) and a(end...

mer än 7 år ago

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Counting in Finnish

Sort a vector of single digit whole numbers alphabetically by their name, in Finnish. See the Wikipedia page for <http://en.wik...

mer än 7 år ago

Solved

radius of a spherical planet

you just measured its surface area, that is the input.

mer än 7 år ago

plot a certain x,y values from a large matrix

You can use the colon operator to select a subset of your vector, like plot(x(500:2500),y(500:2500))

mer än 7 år ago | 0

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Remove all the consonants

Remove all the consonants in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill'; Output s2 is 'a ...

mer än 7 år ago

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How to find the position of an element in a vector without using the find function

Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for. Examples: fin...

mer än 7 år ago

Solved

Is it column vector?

Is it column vector? Check vector for column vector without using iscolumn function.

mer än 7 år ago

Solved

replace empty matrices with '[]'

for example a=1;a(:,1)=[]; returns a = Empty matrix: 1-by-0 use this as the input,and the output should be '[]...

mer än 7 år ago