When the file contains ASCII data, S is a double-precision array. If the file is a MAT-file, S is a struct containing fields that match the variables in retrieved. Returns the contents of a MAT-file in the variable S. The text file must be organized as a rectangular table of numbers, separated by blanks, with one row per line, and an equal number of elements in each row. load replaces leading underscores or digits in filename with an X and replaces other non-alphabetic character with underscores. If filename is not a MAT-file, load creates a double precision array with a name based on filename. If filename is a MAT-file, load creates the requested variables from filename in the workspace. ASCII files may contain MATLAB comments (lines that begin with %). The resulting data is placed into a variable with the same name as the file (without the extension). Reads ASCII files that contain rows of space-separated values. An error occurs if the number of values differs between any two rows. The number of rows is equal to the number of lines in the file and the number of columns is equal to the number of values on a line. Load -ascii filename returns all the data in the file as a single two dimensional double array with its name taken from the filename (minus any extension). With -mat, load returns an error if the file is not a MAT-file. With -ascii, load returns an error if the file is not numeric text. Load -ascii filename or load -mat filenameįorces load to treat the file as either an ASCII file or a MAT-file, regardless of file extension. The wildcard '*' loads variables that match a pattern (MAT-file only). Loads just the specified variables from the MAT-file. If filename has no extension, load looks for file named filename or filename.mat and treats it as a binary MAT-file.
#Load a file in matlab full
Loads all the variables from filename given a full pathname or a MATLABPATH relative partial pathname. Loads all the variables from the MAT-file matlab.mat, if it exists, and returns an error if it doesn't exist. The uibuttongroup function is used specifically to group together buttons other objects can be grouped together similarly using the uipanel function.Load (MATLAB Functions) MATLAB Function Reference
#Load a file in matlab how to
Investigate how to use the image scale function imagesc. In addition to true color images and indexed images into a colormap, a third type of image is an intensity image, which is used frequently for grayscale Investigate how colormaps work with image matrices of types uint8 and uint16. Investigate the imfinfo function, which will return information about an image file in a structure variable. Investigate the colorcube function, which returns a colormap with regularly spaced R, G, and B colors. Investigate the MATLAB functions audioread, audioinfo, and audiowrite. Audio files with the extension “.au” were developed by Sun Microsystems typically, they are used with Java and Unix, whereas Windows PCs typically use “.wav” files that were developed by Microsoft. Several audio file formats are used in industry on different computer platforms. This is the frequency stored in the built-in sound MAT-files. Also, the second argument can be omitted when calling the sound function, in which case the default sample frequency of 819 2 Hz is used.
The first argument to the sound function can be an n x 2 matrix for stereo sound. % Display the sound signals from chirp and train subplot(2,l,l) load chirp plot(y) ylabel ('Amplitude') title ('Chirp') subplot(2 ,l ,2) load train plot(y) ylabel ('Amplitude') title ('Train') For example, the following script creates a subplot that displays the signals from chirp and from train, as shown in Fig. The plot function can be used to display the data. These are supposed to be in the range from – 1 to 1. Sound is a wave the amplitudes are what are stored in the sound signal variable y.
For example, to hear a gong, load the variables from the MAT-file and then play the sound using the sound function: > load gong > sound (y, Fs) Will play the sound represented by the vector y at the frequency Fs. There is a built-in function, sound, that will send a sound signal to an output device such as speakers. These MAT-files include chirp, gong, laughter, splat, train, and handel. MATLAB has several MAT-files that store for various sounds the signal vector in a variable y and the frequency in a variable Fs. In MATLAB, the discrete sound signal is represented by a vector and the frequency is measured in Hertz. Sound signals are usually measured in Hertz (Hz).
The sampling rate, or sampling frequency, is the number of samples taken per time unit, for example per second. In this case, sound waves traveling through the air are recorded as a set of measurements that can then be used to reconstruct the original sound signal, as closely as possible. A sound wave is an example of a continuous signal that can be sampled to result in a discrete signal.
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