# Jacob Ward

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**Content Feed**

How to count date occurrence independently of year?

This is a cool way of visualizing it as well: clear; dates = readtable('C:\Users\jacob\Downloads\Dates.xlsx','ReadVariableName...

3 years ago | 0

I need help with my code. I don't understand what the error code is for. This is the error code Error: File: Lab1Modeling.m Line: 18 Column: 12 The expression to the left of the equals sign is not a valid target for an assignment.

There are a few problems with your code as written: First, you are using curly braces instead of using the while/end or if/end ...

3 years ago | 1

How do I Average across structure

Here's a possible solution I used to solve your problem: clear; close all; % This part just creates dummy data similar t...

4 years ago | 0

| accepted

I keep getting ??? Error using ==> plus Matrix dimensions must agree. Error in ==> dewpoint at 6 f(T,RH)=((a*T)./(b+T))+log(RH/100)

Your T has 4 elements (1x4) while your RH has 8 (1x8). When you try to add them together in your function, MATLAB doesn't know ...

5 years ago | 0

count frequency of each unique occurence in an Nx2 matrix

You could iteratively test each row for the combo you are looking for, adding 1 to the total each time a match is found, like so...

5 years ago | 1

| accepted

please help regarding plot

Doubt you'll get much use out of this, but here's how I recreated the plot in the link you gave! numbers = round(9*rand(5...

5 years ago | 0

Recursion, stock simulation

Instead of giving each variable a name with a different number, store all of these things in one array. So instead of S_0, S_1,...

5 years ago | 0

Read different files with different names (string) in a loop in MATLAB

You don't need to use sprintf. Try the following: C={'a.dat', 'b.dat', 'c.dat',...}; for i = 1:n fid(i) = fopen(C{i}...

5 years ago | 0

| accepted

Need help finding a point on a line.

The polyfit() function you are using gives you the slope and y-intercept of your best fit line. In this case, your p = [0.2190,...

5 years ago | 0

Anybody know how to simplify this?

Not sure about the first one, but for the second one, the for loop and indexing is unnecessary. See this example: This... ...

5 years ago | 0

Use ode values without storing

You could create a function that calls ode23, finds the sum of S, and then returns that sum. Something like this: function...

5 years ago | 0

Calculating radius of circle

Using the following equation: <<http://hawaii.hawaii.edu/math/Courses/Math110/Graphics/Circle.jpg>> You have three unknown...

5 years ago | 3

How can i convert .dat file values into days or months or years? Using Matlab?

If I'm understanding you correctly, maybe try something along these lines: milliSeconds = 221+3.5*rand(15006,1); % This ...

5 years ago | 0

| accepted

I have a matrix which is 1000 columns and 3621 rows, how do I take the mean of each row?

In general, if you have a matrix A and want to take the mean across a certain dimension, dim, you should use mean(A,dim). ...

5 years ago | 1

| accepted

how to eliminate unwanted spikes with peaks

You could try interpolating the data to get a clearer peak. Here's an example: This code generates a peak similar to the one...

5 years ago | 1

Can please somebody check my code and tell me what I ma doing wrong. I am trying to write a code for AM modulated wave of amplitude A to plot N element array of displacement values.

First off, please try to stick to the guidelines for posting questions to this site. See this answer for help in that area: ...

5 years ago | 0

Question

Interp2 yields undesired results on center daigonal.

I am doing cross spectral matrices on some data where they look something like this: <</matlabcentral/answers/uploaded_files/...

5 years ago | 2 answers | 0