# David Fletcher

### De Montfort University

Followers: 0 Following: 0

Prior roles - technician (pharmaceutical chemistry, pharmacognosy and electron microscopy). Currently working as a senior technician in pharmaceutical technology.

**Statistics**

RANK**167**

of 293 920

REPUTATION**684**

CONTRIBUTIONS

**0** Questions

**210** Answers

ANSWER ACCEPTANCE **
0.00%
**

VOTES RECEIVED**78**

RANK

of 20 060

REPUTATION**N/A**

AVERAGE RATING**0.00**

CONTRIBUTIONS**0** Files

DOWNLOADS **0**

ALL TIME DOWNLOADS**0**

CONTRIBUTIONS**0 Posts**

CONTRIBUTIONS**0** Public Channels

AVERAGE RATING

CONTRIBUTIONS**0** Highlights

AVERAGE NO. OF LIKES

**Feeds**

Create a loop for this matrix

Just writing something with a loop on the fly (and I stress this is neither robust, nor particularly efficient), but it may be s...

mer än 3 år ago | 0

| accepted

Build an array of square and square root of user input

The code you have written largely does what is asked, the only thing that is missing is that you are throwing the calculated sqr...

mer än 3 år ago | 0

| accepted

plotting multiple line graphs in one plot

Might need some more tinkering - this is limited to 7 lines rather than the 20 you have in your code tc(1:20)=298; th=300:50:1...

mer än 3 år ago | 0

| accepted

I need help with the error called 'Error using vertcat Dimensions of arrays being concatenated are not consistent.'

The statement tries to stack a 2x2 on top of a (2x4) x 2 M = [diag(checkpoint)-diag(checkpoint); -eye(2) zeros(2); zeros(2) eye...

mer än 3 år ago | 0

| accepted

Removing row of a nx3 matrix if at any row the 3rd column is 0

b = [1 2 0;3 4 5;3 2 -1;5 6 0;1 3 6] idx=b(:,3)<=0 b(idx,:)=[]

mer än 3 år ago | 0

| accepted

How to multiply 8*8 data sets elementwise?

If you're just multiplying by the scaler of 1.02 then Qxxepoch1{:,:}*1.02 will do what you want without a loop

mer än 3 år ago | 0

| accepted

How to process multiple dot mat file using for loop

Wouldn't it be better to extract what you want into a single matrix and then just save the one matrix with all the data rather t...

mer än 3 år ago | 1

Write a function wich oly needs a file input as argument

It's a warning that you have declared variables (decYear, intYear, dayNum etc.) and not used them anywhere in the code. The code...

mer än 3 år ago | 0

How do i scan pixel from an rgb image and then if red value is higher than 200 show red only and if its lower = all 3 colors = 0

May not be the best answer - I don't do much image manipulation work %load and display image imageData=imread('test.jpeg'); s...

mer än 3 år ago | 0

| accepted

Extract multiple matrices from an array by excluding specified numbers.

Will do the job in this case, but is not massively robust. Would need additional code to enforce the number of elements in the v...

mer än 3 år ago | 0

| accepted

how can i edit the input prompt while using inside a loop

n = 5; i=1; while(i<=n) prompt=sprintf('Enter the value of Lower Bound %d \n a =',i); a = input(prompt) ...

mer än 3 år ago | 1

| accepted

Combine logical cell array based on 'or' condition

C{1,1}|C{1,2}|C{1,3}

mer än 3 år ago | 0

if variable i = zero then change row j of the same row to 0 - table

col16zero=(pvdaqdata10{:,16}==0) pvdaqdata10{col16zero,3}=0

mer än 3 år ago | 1

| accepted

How can I separate the data into two groups.?

%Get index of max values in each column [val idx]=max(data) %Create logical vector of max values where the max value is the fi...

mer än 3 år ago | 1

| accepted

How to write (partial)file names into a table?

Try this - (I'm assuming you want to store the extracted chars as an actual number) integ(m,4)=str2double(extractBetween(fileNa...

mer än 3 år ago | 0

| accepted

A task that requires multiple outputs in a specific order.

function [a, b, c, d] = corners(matrix) a=matrix(1,1); b=matrix(1,end); c=matrix(end,1); d=matrix(end,end); ...

mer än 3 år ago | 0

| accepted

For loop to extract string with if function

Nothing seems to be particularly wrong in the code - the only thing that stands out is that the str variable will be overwritten...

mer än 3 år ago | 1

| accepted

Doubt involving a for loop within another

Try changing the line to: jvals(i,:)=linspace(0,0.03,n) You may also need to change the line to curvatura=jvals(i,j) if curv...

mer än 3 år ago | 0

| accepted

Obtain and plot values of a "for" loop

you need to retain the values of y as you go through each iteration of the loop. There are a few ways of doing it, but perhaps t...

mer än 3 år ago | 0

| accepted

help me , Treasure hunt game code

Try this: f = floor(rand()*100) + 1; n = 0; while 1 t = input('t') if t<f disp('up') elseif t>f ...

mer än 3 år ago | 1

| accepted

I want to do the calculations in the for loop for each diameter, D value, and then draw the graph for each result, but with this code, I calculate one value and only one value appears in the graph. Where am I doing wrong? Sorry I'm beginner in mtlab

As a general guide have a look at: L=(2000+(5*50)); T=5+5*0.25; It=0.0075*L; ht=0.15*T; bt=0.50*It; e=0.0003*(5+50); t=15...

mer än 3 år ago | 0

| accepted

How to execute the same operation on various .csv files?

You would need to incorporate your code into one of the examples, also you would need to store the intended output as the loop p...

mer än 3 år ago | 0

| accepted

Problem with if statement

There are numerous errors in the code, the condition on the if statement makes no sense I assume you mean: if r(i)>=minval & ma...

mer än 3 år ago | 0

| accepted

How to get the x axis and y axis to start at 0 when adding regression line in Figure window

Does the axis command do anything: axis([0 70 0 70])

mer än 3 år ago | 0

I'm getting an error and don't know how to fix it.

The filename is the name held in the variable, the file isn't called 'filename' fid=fopen(filename,'r')

mer än 3 år ago | 1

| accepted

I want to draw graph. use 'for/while-end loop' and use 'plot' just one time

Something like: %06_Diffusion clear C0 = 0.2; % wt% Cs = 1.0; D = 2.6e-11; x = 0:0.1:10; % mm x = x./1000; % meter index...

mer än 3 år ago | 0

| accepted

Concatenating variables within a table

Not sure if this is what you want, but stack will pack the table packedTable=stack(T1,1:114) You'll end up with two columns: ...

mer än 3 år ago | 1

| accepted

Show rows of a column of a table that meet a certain condition in another column

table.x(table.y==0)

mer än 3 år ago | 0

| accepted

How to get the last two digits of a number?

x=4974 y=floor((x/100-floor(x/100))*100)

mer än 3 år ago | 2

| accepted

Array indices must be positive integers or logical values

Error is caused by element 1481 of IntOutAdr which is 0 - this will cause an indexing error

mer än 3 år ago | 1