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Bob Nbob


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368 total contributions since 2016

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Answered
i need some help
If I'm understanding what you're trying to do, you're only missing parentheses. >> n = 10; >> p(10) = 2; >> p(n) p(n) = ...

4 días ago | 0

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plot graphic with different color
If you're using the plot command, it is relatively easy to define a different color for a plot. Setting the condition where this...

7 días ago | 0

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How to map and plot each y coordinate in a y coordinate array with each coordinate in a x coordinate array??
plot(X,Y) Was there something more to your question that I didn't understand?

15 días ago | 0

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Adding to a vector after each step of a for loop.
You need to specify the index of the element you want to replace. for i = 1:1000; steps(i) = i; end Realistically though...

15 días ago | 0

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Answered
Hello! Can you help me with this?
It seems to me like you're totally overcomplicating this. Let me know if I'm interpretting the steps of your code correctly. Th...

alrededor de 1 mes ago | 0

Answered
Access previous iteration in while loop to derive stopping criterion for differential equation correction-prediction method
In MATLAB, you cannot access the previous iteration of a loop directly. If you want to utilize that information you need to eith...

alrededor de 1 mes ago | 0

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Answered
How can remove Excel column by MATLAB
The simplest way is to load the excel file with xlsread, then write the data back with only the desired columns using xlswrite. ...

3 meses ago | 0

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Plotting a matrix in a for loop.
With MATLAB you don't really want to perform the plot inside the loop in this case. Just save your results in a matrix and plot ...

3 meses ago | 0

Answered
How to save more than the last matrix in a for cycle
You need to index Sigma_elem. Sigma_elem(:,:,i,N)=EPSM(N,1:6).*e_mat/0.6; % Or something similar

3 meses ago | 0

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Plotting a 3-D Matrix, but only for some points
I would suggest using scatter3 to make the actual plot. I would suggest using something like find to identify the locations of t...

3 meses ago | 0

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how to calculate how many rows are having numeric values in a particular cell of an excel sheet data.
Read the file with xlsread, filter the NaN values, then determine the number of the remaining values. numnumerics = sum(~isnan(...

3 meses ago | 0

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Answered
Extract and code gender string as number using if loop
Just to clarify, you have 'gender' as two separate variables, once as a variable called 'gender' which will have a numeric assig...

3 meses ago | 0

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overly convoluted elseif condition
You can replace all of them with a single statement and indexing. if x>=1 & x<=4 y = p(x); else y = 1; end

3 meses ago | 0

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Answered
How to increment matrix row only inside a nested for loop?
The solution is indexing. You can do math in your index if you need to. x((i-1)*5+j) = i*j;

4 meses ago | 0

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filtering data with a for loop and plot only filtered data
This can be done much more simply with logic indexing. quer = meas.ay.data; quer = quer(quer > 1.5 | quer < -1.5); plot(quer)...

4 meses ago | 1

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Answered
Replace values in collumns
You can just index your matrix to reorder it, assuming all of the columns are the same type of data (i.e. all of column 6 is z2,...

4 meses ago | 0

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2 variable for-loop
The issue is with your definition of test. Nested for loops are totally fine. test(:,ss)=TKE_dave(:,ss); On your last loop te...

4 meses ago | 1

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Answered
Error Unable to perform assignment because dot indexing is not supported for variables of this type.
You are receiving the error because you have already defined the class of the first level as a character. In order to add a seco...

4 meses ago | 0

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Answered
Changing Variable in matrix
Why are you originally defining A as A = [a b c]? This isn't very common or efficient matlab usage. I would suggest starting wit...

4 meses ago | 0

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Could someone please optimize this code?
I don't know about 'optimized,' but I'm pretty sure you can remove the entire for loop by vectorizing. Also, suppressing your va...

4 meses ago | 0

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How can I assign a variable to all the columns and all the rows of a matrix?
You don't need to actually create a new variable for this, you can just use the results from size. A = randi(100,20,10); [r,c]...

4 meses ago | 0

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A for loop with matrix as step
I'm confused what you're trying to do. From the psuedo code you wrote it looks like you're trying to loop through each of the a...

4 meses ago | 0

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Choose a cell array that satisfy better some criteria
Ok, here is what I have come up with. It will probably still need some tweaking, but you should be most interested in the calcul...

4 meses ago | 0

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Answered
Is the find function a robust method to determine the number of specific values in a Matrix?
That method will certainly work, and I would generally use the same concept. I would just use the sum command though to avoid th...

4 meses ago | 1

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Answered
can any one explain this line of the code.
Per matrix math rules, when you add a single value to a matrix, that operation is applied to all values of the matrix individual...

4 meses ago | 0

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Answered
Find all the words contained in a file and make an index
You are on the right track, but you aren't calling the word index correctly. Also, I would suggest using strfind instead of the ...

5 meses ago | 0

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Describing a sum with a while loop
I'm pretty sure that adding a big number to 0 will bump you over pi on the first iteration, but maybe that's just me. I would do...

5 meses ago | 0

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Select value from the list by defining criteria
I would use readtable to import the data, the logic indexing to narrow down the results. data = readtable('mydata.xlsx'); redu...

5 meses ago | 0

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Answered
How to make matlab variables named as excel header
It sounds like readtable might be what you're looking for. I don't think it's exactly what you're asking, but it should recogniz...

5 meses ago | 0

Answered
Matrix from an array
Not sure how to do it without a loop or just defining the indices, but here's something simple. A = 1:15; for i = 1:length(A)/...

5 meses ago | 0

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