Community Profile # David Fletcher

### De Montfort University

Last seen: ungefär 2 år ago Active since 2018

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

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 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 2 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 2 år ago | 0

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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 2 år ago | 0

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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 2 år ago | 1

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Combine logical cell array based on 'or' condition
C{1,1}|C{1,2}|C{1,3}

mer än 2 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 2 år ago | 1

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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 2 år ago | 1

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 år ago | 1

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 år ago | 1

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 år ago | 0

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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 2 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 2 år ago | 1

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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 2 år ago | 0

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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 2 år ago | 1

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Show rows of a column of a table that meet a certain condition in another column
table.x(table.y==0)

mer än 2 år ago | 0

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