# Ryan Takatsuka

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**Content Feed**

Question

Spectral analysis in MATLAB script

I am trying to minimize the spectral leakage in the frequency analysis of a signal to obtain accurate magnitudes of all the freq...

3 years ago | 2 answers | 1

### 2

answersQuestion

Filtered signal's frequency response is not correct

I am trying to pass a pure noise signal through a filter, but the frequency response is not what I expected. I have attached th...

3 years ago | 0 answers | 0

### 0

answersLog equation log(x) not plotting correctly

y_3 contains complex numbers with real and imaginary components, and the plot() function only plots the real component of the co...

3 years ago | 1

Question

Element-wise product in Simulink

I would like to perform an element-wise multiplication (Hadamard product) between 2 matrices in Simulink. The "multiply" block ...

3 years ago | 0 answers | 0

### 0

answersProblem having isoutlier detecting anything

The outlier detection generally works best on single data point outliers (not multiple in a row). Your data has a large amount ...

3 years ago | 0

measuring force in a spring dashpot model

The _Ideal Force Sensor_ should be in series with the mechanical system. See the attached example.

3 years ago | 1

| accepted

How can I control the pulse generator percentage with variable?

You can create a custom PWM subsystem where the pulse percent is the input. See attached example.

3 years ago | 0

| accepted

How can I measure percentage of pulse signal

You are probably better off filtering the PWM signal to find the interval percentage. See the attached example.

3 years ago | 0

| accepted

How to have a plot3 vector and sphere on same figure?

Try something like this: figure(1) %creating animation window sphere % creating sphere for visualization alph...

3 years ago | 0

| accepted

PID to control solenoid valves on simulink?

Typically, solenoid valves only operate as binary valves (either on or off with no in between). From what you are describing it...

3 years ago | 0

update parameter during simulink simulation

If you use external gains for the PID block, you can easily modify them during the simulation. Because you want the PID to swit...

3 years ago | 2

| accepted

Is it possible draw left y-axis with red color and the right y-axis with blue color?

Yes it is. Here is an example of a plot with different y axis colors: t = linspace(0,1,1000); a = sin(2*pi*t); b = s...

3 years ago | 1

| accepted

After importing data from excel and plotting them, I need to subtract the noise and extract only the five peaks, and finally to find the area under the peaks? Can anyone tell me what function to use?

You can probably apply a highpass filter to the data to isolate the peaks. This should remove the low frequency/offset of the p...

3 years ago | 0

| accepted

Solved

Prime Product

My professor has given a sequence of N numbers as a1, a2, ..., aN and asked me to find the smallest possible value of ai * aj su...

3 years ago

Solved

5th Time's a Charm

Write a function that will return the input value. However, your function must fail the first four times, only functioning prope...

3 years ago

Solved

"Cody" * 5 == "CodyCodyCodyCodyCody"

*Alice*: What? *"Cody" * 5 == "CodyCodyCodyCodyCody"*? You've gotta be kidding me! *Bob*: No, I am serious! Python supports...

3 years ago

Solved

The 5th Root

Write a function to find the 5th root of a number. It sounds easy, but the typical functions are not allowed (see the test su...

3 years ago

Solved

Pizza!

Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

3 years ago

Solved

Determine if input is odd

Given the input n, return true if n is odd or false if n is even.

3 years ago

Solved

Make a checkerboard matrix

Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Examp...

3 years ago

Solved

Find the sum of all the numbers of the input vector

Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

3 years ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]

In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

3 years ago

Solved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

3 years ago

Saving figure data statistics without using the GUI?

You can create a function to collect this data for you. To create a structure with the same format as Tools -> Data Statistics ...

3 years ago | 0

| accepted

Question

Simulink Zoom FFT - error in native MATLAB example (dspzoomfft)

I am trying to understand the Zoom FFT algorithm, and am playing around with the native MATLAB example for Simulink (opened by t...

4 years ago | 0 answers | 0

### 0

answersQuestion

Improvements for rapid Simscape changes with discrete valves

I have a Simscape model that consists of a few valves and constant volume chambers. Every time a valve is opened, the instantan...

4 years ago | 1 answer | 0

### 1

answerQuestion

Simscape gas pipe element causes initialization errors

I have a Simscape model with a long thin (an inner diameter of 0.030") tube in the middle. When the tube is shorter (less than ...

4 years ago | 1 answer | 0

### 1

answerQuestion

3/2 pneumatic valve model

I am trying to design a 3/2 pneumatic valve (3 ports and 2 positions). The valve has a supply port, common port, and an exhaust...

4 years ago | 1 answer | 0