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Matlab limit

Matlab limit

Introduction to Matlab limit

The limit() function is used to impose limit on the minimum and maximum value for a symbolic expression in order to maintain them within a defined specific range. The limits can also be applied to any Matlab plot using the commands xlim, ylim and zlim. The limits are useful for various data analysis and behavior at different ranges of data value.

Syntax of Matlab limit

Given below are the syntax of Matlab limit:

Syntax Description
limit(f,var,a) limit(f,var,a) form of the function is used to return the symbolic expression f with imposition of the Bidirectional Limit when var tends to a.
limit(f,a) limit(f,a) form of the function is used to return the symbolic expression f with imposition of the Bidirectional Limit when the default variable that is found by symvar, tends to reach the value, a.
limit(f) limit(f) form of the function is used to return the symbolic expression f having the values being limited to value, 0.
limit(f,var,a,’left’) limit(f,var,a,’left’) form of the function is used to return the symbolic expression f having the values being limited to value by the Left Side Limits for ‘f’ as var tends to reach the value a.
limit(f,var,a,’right’) limit(f,var,a,’right’) form of the function is used to return the symbolic expression f having the values being limited to value by the right Side Limits for ‘f’ as var tends to reach the value a.

Input Arguments

Given below are the input arguments:

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  • Input (f): The input to the function is denoted as f. It can be specified as a function, symbolic expression, matrix or vector.
  • Independent variable (var): Independent variable is a symbolic variable, denoted as ‘var’. When var is not defined explicitely, then ‘symvar’ determines a default variable as the independent variable.
  • Limit point (a): The limit values for the input ‘f’ can be specified in terms of a number or a symbolic number, variable, or expression.

Example #1

Code:

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syms var delta
func = cos(var)/var; //function1 expression as input
limit(func,var,0)// limit of var tends to 0
func = (cos(var+delta)-cos(var))/delta; //function2 expression as input
limit(func,delta,0)//limit of delta tends to 0

Output:

  • Output 1: The threshold value for the function func where var=0.
  • Output 2: The threshold value for the function func where delta=0.

Considering a sin function.

Matlab limit 1

Example #2

Code:

syms var delta
func = sin(var)/var; // sin(var)/var is input to the function
limit(func,var,0) // evaluating function func where var tends to 0
f = (sin(var+delta)-sin(var))/delta; //(sin(var+delta)-sin(var))/delta is input
//to the function
limit(func,delta,0) //evaluating function where delta tends to 0

Output:

Considering a cos function.

  • Output 1: The threshold value for the function func where var=0.
  • Output 2: The threshold value for the function func where delta=0.

Matlab limit 12

Example #3

Code:

syms var
func = 1/(2*var); //Input to right side limit function
limit(func,var,0,'right') //Executing right side limit function on the input
//function func

Output:

The output is the result of the value for the function func where value of the var is near to 0 being a positive value.

Matlab limit 3

Example #4

Code:

syms var
func = 1/(2*var); //Function as input for left side limit function
limit(func,var,0,'left') //Executing left side function on input function

Output:

The output is the result of the value for the function func where value of the var is approximate to 0 being a negative value.

value for the function func

limit of Expressions in Symbolic Vector

limit function in Matlab also supports to be imposed with symbolic vector. In that case the function acts on the vector element-wise.

Example

Code:

syms var delta
Vector = [(1+delta/var)^var exp(-var)]; //The vector on which the limit is
//imposed
limit(Vector,var,Inf) //Executing limit function on the vector

Output:

The output in the form of 2X1 vector is produced as value of var as inf for each element of 2X1 vector ‘Vector’.

form of 2X1

Specify Axis limits

The range of data points on any Matlab plot can be controlled and coordinates of data to be appeared in the x-axis, y-axis, and z-axis having limits imposed on the respective axes using xlim, ylim and zlim respectively. The appearance of lines along x-axis and y-axis in case of only 2-D plots can be altered or reversed with respect to the direction in which the values are presented in increasing order along each axis.

Example #1

Code:

xdata = linspace(-15,15,150); //Defining data points along x-axis
ydata = sin(4*xdata)./exp(xdata); //Defining data points along y-axis
plot(xdata,ydata) //Creating the 2 dimensional plot
xlim([0 10]) //Imposing limits on data points along x-axis
ylim([-0.5 0.7]) //Imposing limits on data points along y-axis

Output:

Matlab limit 6

Example #2

The limits for 2 dimensional plot can either be decided by the program explicitly or by the Matlab to pick any default value depending on the function and acceptable values across the axes.

In the below example, the maximum limit on x-axis is set to 0 and the minimum value on y-axis is set to -1. Limit values for the other edges are left to be chosen by Matlab. In order to incorporate an automatic calculation process to decide on minimum and maximum limit, the values -inf or inf are used respectively.

Code:

xdata = linspace(-15,15,150); //Defining data points across x-axis
ydata = sin(4*xdata)./exp(xdata);//Defining function across y-axis
plot(xdata,ydata) //Creating the 2 dimensional plot
xlim([-inf 0])  //Imposing partial limit on x-axis data points having upper value
//limit fixed to 0
ylim([-1 inf]) //Imposing partial limit on y-axis data points having lower value
//limit fixed to -1

Output:

on x-axis is set to 0 and the minimum value on y-axis is set to -1.

As per the requirement of the algorithm or user, the limits can be reverted back to default values in the 2 dimensional plot using xlim, ylim or zlim followed by keyword ‘auto’.

Code:

xdata = linspace(-15,15,150); // Defining the data points across x-axis
ydata = sin(4*xdata)./exp(xdata); //Defining the function for y-axis
plot(xdata,ydata) //Creating the 2 dimensional plot
xlim([-inf 0]) //Imposition of limits on x-axis values
ylim([-1 inf]) //Imposition of limits on y-axis values
xlim auto //Reverting limits on x-axis data points to default value
ylim auto //Reverting limits on y-axis data points to default value

Output:

can be reverted back to default values

Additional Note:

There are 3 scenarios of applying limits by the limit() function in Matlab such as:

1. This is applied to include bidirectional limits:

Matlab limit 9

2. This is applied to include left side limits:

Matlab limit 10

3. This is applied to include right side limits:

Matlab limit 11

Recommended Articles

This is a guide to Matlab limit. Here we discuss the introduction, limit of expressions in symbolic vector and specify axis limits. You may also have a look at the following articles to learn more –

  1. Magnitude Matlab
  2. Mat2cell Matlab
  3. Eval Function MATLAB
  4. Matlab Object
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