# Ricardo Duarte

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**Content Feed**

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How to generate a signal

Dear all, I want to generate a signal similar to the one in the following picture (black line only). How can I do that. I...

13 days ago | 1 answer | 0

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How to obtain the channel impulse response through sound pressure levels

Dear all, I would like to obtain the channel impulse response through the sound pressure level. How can I do that? Is there a...

1 month ago | 0 answers | 0

### 0

answersQuestion

Meaning of a code line

Dear all, I have an old piece of code that I'm trying to understand. The line that is confusing me is: eval( [ '!copy ' fi...

1 month ago | 1 answer | 0

### 1

answerQuestion

Replace value that are associated to a location by nan

Dear all, I have a question that I hope you can help me. I have a map of sound pressure levels (spl) in which I patched a whi...

3 months ago | 1 answer | 0

### 1

answerQuestion

Changing the coordinate system from WGS84 to matlab coordinate system

Dear all, I have a ".nc" file (attached) containing the dolphin dispersion in one specific area which was imported from ARCGIS ...

3 months ago | 0 answers | 0

### 0

answersQuestion

How to change the colorbar limits in a previously saved fig file

Hello, I have a figure containing a colorbar that I saved in a .fig format. Now I need to open it and change the limits of the...

3 months ago | 1 answer | 0

### 1

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How to increase the performance of a cycle for in its use in large matrices?

Dear all, I have four matrices NewZ(1x20), Longitude(1000x1), Latitude(1000x1) and depthgrid(1000x1000). Note that depthgrid re...

4 months ago | 1 answer | 0

### 1

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How to assign a specific values to the nearest X,Y point

Dear all, I have two vectors X and Y which represents the vertices of a delauny triangulation. Additionally I have two other v...

4 months ago | 1 answer | 0

### 1

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Interpolation of layers to obtain a layer in the orthogonal plan

Dear all, I have three variables S1, S2 and S3 with the size (1000x1000) all that represent the sound levels in three differen...

4 months ago | 1 answer | 0

### 1

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Export matlab variable to be imported in QGis

Dear all, I need to export a 1000x1000 matrix containing sound pressure level of a specific region to be later imported at QGis...

4 months ago | 0 answers | 0

### 0

answersQuestion

How to create a heatmap from recorded positions

Dear all, Im trying to create a distribution map (or heatmap) from a table that represents ships positions (see figure). Bas...

4 months ago | 1 answer | 0

### 1

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How to link x-axis of two plots in one single plot if they have diferent sizes

Dear all, I have the following plot. Y-axis corresponds to the depth and X-axis corresponds to the range And I have also a s...

7 months ago | 1 answer | 0

### 1

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How to obtain a section from a surf plot

Dear all, I have a surface plot that represents the bathymetry of a given surface: x=longitute; y=latitude; z=depth; No...

7 months ago | 1 answer | 0

### 1

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Moving points together along a specified path

Dear all, I have a question regarding the displacement of a point through time along a specified path. For example, I created ...

7 months ago | 0 answers | 0

### 0

answersHow to create several figures in a subplot with different axes

I overcame this by doing the following code: ax1=axes; subplot(7,1,k,ax1); imagesc(ax1,Xv,Yv,M); set(gca,'YDir',...

7 months ago | 0

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How to create several figures in a subplot with different axes

Dear all, I'm trying to create a subplot with 7lines and 1 column that plot all of my results consecutivelly. I have this piec...

7 months ago | 2 answers | 0

### 2

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Concatenate variables with similar names

Dear all I need to concatenate several variables with similar name. For example: T=cat(3,SPL_A,SPL_B,SPL_C,SPL_D,SPL_E). Th...

8 months ago | 2 answers | 0

### 2

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Percentile calculation along time

Dear all, I have a time series analysis in which i should calculate its percentiles. Let me explain: I have 5 matrices (A,B,C...

8 months ago | 1 answer | 0

### 1

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Deleted files generated with matlab keep occupying space in the hard drive and I can't locate them

Dear all, I have a tricky question regarding deleting files using matlab. Let me explain. I created a program that generates ...

8 months ago | 1 answer | 0

### 1

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Moving point along a rectangular path

Dear all, I would like create a point that moves along a path (as in the figure) knowing only the initial and the final positio...

8 months ago | 1 answer | 0

### 1

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Implementing a seismic source

Dear all, I'm a new matlab user and I need to create a seismic pulse which the emitting source is moving (time dependent). I h...

9 months ago | 0 answers | 0

### 0

answersQuestion

Problem doing plots using contour with NaN elements in a matrix

Dear all, I have 3 matrices: lon, lat, depth. Than I want to remove all the depth values that are bigger than 0. To do so I us...

11 months ago | 0 answers | 0

### 0

answersQuestion

Sum overlapping region using surf

Dear all, I'm new in matlab and i'm doing some difficult stuff I guess... I have 9 matrix (x1,y1,tl1, x2,y2,tl2 and x3,y3,tl3)...

12 months ago | 0 answers | 0

### 0

answersQuestion

Density maps based on the number of occurences

Hello dear all, I'm trying to create a density map based on the ships distribution along the time in latitude and longitude coo...

1 year ago | 0 answers | 0

### 0

answersQuestion

How to create a function that do not require all the input paramenters

Dear all, I'm quite new using matlab and I'm trying to create a function with +- 30 input parameters. Then, when I call the fun...

1 year ago | 1 answer | 0

### 1

answerQuestion

How can I pass a variable between a m-file and another m-file that runs a gui?

Hello, I'm trying to pass a variable between one m-file and another m-file that initiates gui. More specifically: I have one ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Passing varibales between two callback in GUI

Dear all, I really need your help. I'm new using Gui and I'm trying to use one variable in one callback that was calculated p...

1 year ago | 1 answer | 0

### 1

answerQuestion

Order h5 file hierarchy

Hello, I'm trying to create a h5 file to exchange data. I already create the structure but when I type "h5disp('xxx.h5')" the ...

1 year ago | 0 answers | 0

### 0

answersQuestion

Calculate Equivalente Continuous Sound Level

Dear all, I'm new coding with matlab and I'm trying to calculate some sound quantities and I'm experiencing some difficulties c...

1 year ago | 0 answers | 0

### 0

answersQuestion

How can I write a variable which datatype is a string in netcdf file

Hello, Im new using Netcdf files. I need to write a variable which is a string in a netcdf file. I tryied this: nccreate(file...

1 year ago | 1 answer | 0