**Finding the slope and y intercept of lsline**Hi All
I had used lsline function to find the least square line.Can you help
me for finding the slope and y intercept of the least square line.
Thanks in advance
PMN
PMN <praveenmn1@gmail.com> wrote in message <908774cc-7a99-4819-9dae-db0f7d4ee65b@o16g2000prh.googlegroups.com>...
> Hi All
>
> I had used lsline function to find the least square line.Can you help
> me for finding the slope and y intercept of the least square line.
>
> Thanks in advance
> PMN
hi.........no need to use lsline........if u r only want to find out slope and intercept ....o it w...

**Slope and Intercept**Hi,
I have two columns X and Y. Is there a way to find out the slope and
intercept for the columns?
Thanks much for the help
...

**slope and intercept**Dear MATLAB community,
I am trying to determine the slope (a) and intercept (b) for
a linear fit y = ax+b.
I know the function postreg ([slope,intercept,r] =
postreg(x',y']) will do it for me, but I would like to find
a function that calculates these parameters without the plot
postreg creates
Thank you for your inputs,
Benoit
"Benoit " <igneb@iastate.edu> wrote in message
<g36uct$1m6$1@fred.mathworks.com>...
> Dear MATLAB community,
>
> I am trying to determine the slope (a) and intercept (b) for
> a linear fit y = ax+b.
>
> I know the ...

**to find slope**hi
how to find slope for logarithmic curves using matlab......
...

**How to find a slope of line.**hi
I have a plot with diff values of x and y.
i want to find the plot of that linear function slope.
like y=mx+c
and m= slope.
Hi Maulik,
Polyfit should help you.
Best.
...

**Re: Slope and Intercept**Hi,
Are you trying to do a regression?
If so, proc reg will do.
--
Regards,
Murphy Choy
Certified Advanced Programmer for SAS V9
Certified Basic Programmer for SAS V9
DataShaping Certified SAS Professional
-----Original Message-----
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of sasbegy
Sent: Tuesday, April 28, 2009 11:27 PM
To: SAS-L@LISTSERV.UGA.EDU
Subject: Slope and Intercept
Hi,
I have two columns X and Y. Is there a way to find out the slope and
intercept for the columns?
Thanks much for the help
I wonder if sasbegy is referring to point slope and intercep...

**extrapolate to find the intercept**hi all,
i'm sure this is a simple one but i'm not sure how to do this the most efficient way in matlab: i have a vector x=[2.5;3.456];. how do i extrapolate this vector so that it hits the intercept? or find the intercept in a different way? is there a simple function for that?
any help is appreciated.
"Linda" wrote in message <l3r34b$7j9$1@newscl01ah.mathworks.com>...
> hi all,
>
> i'm sure this is a simple one but i'm not sure how to do this the most efficient way in matlab: i have a vector x=[2.5;3.456];. how do i extrapolate this vector ...

**Finding the slope/ gradient**Hi all
I m given a point P in 3-D , (x,y,z ) values. And its 8 connecting points ( 3-D points.... (x,y,z) values) i.e. these 9 points can be considered to be placed in the form of a 3x3 matrix. I have to find the gradient of the plane containing this 9 points at the (2,2) pt P (mid point of the 3x3 matrix).
I tried to use the sobel kernal type weighted summation of the difference of the points and then divide it by dx (or dy) but that didnt work out. I am considering that the z value of the (x,y,z) values as the function value.... z=f(x,y).
I am not sure if matlab has an inbuilt func...

**Error in slope and intercept**I was informing myself about linear regression with error in both observables and found this algorithm: (Weighted Orthogonal Regression by Alternating Least Squares)
worals[x_, y_, sx_, sy_] := Block[{a,b,f,z, u = 1/sx, v = 1/sy, w = (sy/sx)^2},
{a,b} = (y*v).PseudoInverse@{v,x*v}; f = #.#&[(a+b*x-y)v];
While[f > (z = (x*w + (y-a)b)/(b^2 + w);
{a,b} = (y*v).PseudoInverse@{v,z*v};
f = #.#&@Join[(z-x)u,(a+b*z-y)v])];
{f,{a,b}}]
which gives me {chisquare, {intercept, slope}} as output.
This works prefectly fine but I'd like to get the error on slo...

**finding slope regions**
This issue seems simple at first, but has proven to be quite an algorithmic challenge. I’d appreciate any insights.
We have data that appears as combinations of straight lines in log-log plots, say a slope of 0.3 followed by a slope of 1.6. We'd like to fit lines to the data and get their parameters.
The data is experimental, so is of course quite noisy, just seems pretty straight in log-slope... In addition, between different slope regions, e.g. slope of 0.3 and 1.6, there are rounded "knees". The knee regions change in curvature and total length from plot to plot, ...

**slope**What is the slope-intercept equation of the line that contain the
point (3,2) and has slope m=4?
What is the slope and y intercept of the line represented by the
equation: 2x + 2y =3?
Thanks,
SH
Sonia Haynes wrote:
>
>
> What is the slope-intercept equation of the line that contain the
> point (3,2) and has slope m=4?
>
> What is the slope and y intercept of the line represented by the
> equation: 2x + 2y =3?
>
> Thanks,
> SH
look in an elementary maths textbook
Sonia Haynes wrote:
> What is the slope-intercept equation of the line that contain the
> po...

**Error on slope and intercept**I was informing myself about linear regression with errors in x and y.
I dont really understand the theory behind the following algorithm but it would be nice if someone could tell me how i get the error of the intercept and slope.
worals[x_, y_, sx_, sy_] :=
Block[{a, b, f, z, u = 1/sx, v = 1/sy, w = (sy/sx)^2},
{a, b} = (y*v).PseudoInverse@{v, x*v}; f = #.# &[(a + b*x - y) v];
While[f > (z = (x*w + (y - a) b)/(b^2 + w);
{a, b} = (y*v).PseudoInverse@{v, z*v};
f = #.# &@Join[(z - x) u, (a + b*z - y) v])];
{f, {a, b}}]
Thanks for any help
...

**extrapolate to find the intercept #2**hi all,
i'm sure this is a simple one but i'm not sure how to do this the most
efficient way in matlab: i have a vector x=[2.5;3.456];. how do i
extrapolate this vector so that it hits the intercept? or find the
intercept in a different way? is there a simple function for that?
a) doc interp1
b) doc polyval % and friends
c) how would you find slope/intercept w/ simple algebra??? Implement
same...
--
...

**Re: Slope and Intercept #6**I am not familiar with the excel functions that you mention.
If you wish to fit a least squares line to your data, your best solution is
to run either Proc Reg or Proc Glm. While you could calculate the two terms
my doing the calculations found in any elementary stat book, it is not
worth the effort when the procs are there. If you simply want to know the
slope of a line drawn between the two extreme points and they have the
values of x1, y1 and x2, y2, then the formula is
(y2 - y1 )/ ( x2 - x1 )
if I remember my 9th grade geometry class. I don't recall the formula for
the intercept off...

**Re: Slope and Intercept #2**the SAS equivalent to
slope(y1:y100,x1:x100)
intercept(y1:y100,x1:x100)
is (as already pointed out):
proc reg;
model y = x ;
run; quit;
so yes, you are doing linear regression here.
There are other ways to do the same calculation, though this is the
simplets, if you have SAS/STAT.
Robin High
UNMC
sasbegy <pattukuttani@GMAIL.COM>
Sent by: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
04/28/2009 03:04 PM
Please respond to
sasbegy <pattukuttani@GMAIL.COM>
To
SAS-L@LISTSERV.UGA.EDU
cc
Subject
Re: Slope and Intercept
On Apr 28, 3:41 pm, Shankar <...

**Re: Error in slope and intercept**On Wed, Oct 02, 2013 @ 02:53 AM, Gebbo <nicolasgebbo@googlemail.com> wrote:
> I was informing myself about linear regression with
> error in both observables and found this algorithm:
> (Weighted Orthogonal Regression by Alternating Least Squares)
>
> worals[x_, y_, sx_, sy_] := Block[
> {a,b,f,z, u = 1/sx, v = 1/sy, w = (sy/sx)^2},
> {a,b} = (y*v).PseudoInverse@{v,x*v}; f = #.#&[(a+b*x-y)v];
> While[f > (z = (x*w + (y-a)b)/(b^2 + w);
> {a,b} = (y*v).PseudoInverse@{v,z*v};
> f = #.#&@Join[(z-x)u,(a+b*z-y)v])];
>...

**slope and intercept values on a graph**Hello,
I have [A1], [B1] and [A2] [B2] plotted on a graph using the robust linear regression function.
What I want is to manage to show on the graph a textbox the values of slope and intercept of which are calculated by the robust linear regression.
At the moment I do it through the property editor. However, I'd like this to be done automatically.
Thanks
J.
"John M" <ioannis.mitsos@gmail.com> wrote in message <iape11$lt5$1@fred.mathworks.com>...
> Hello,
>
> I have [A1], [B1] and [A2] [B2] plotted on a graph using the robust linear regression...

**finding multiple intercepts or solutions**Hi
I'm new to MatLab and I'm working on a bouncing ball project modeled
as a mass-spring-damper.
I'm having trouble finding multiple solutions to an expression with
the solve command. I'd would like to know all the solutions within a
range instead of just the first one. I don't if finding multiple
intercepts is possible or not. I'm not look for zeros.
...

**finding the slope of annotation lines**Hey all,
I am writing a GUI that will load some data, plot it in a figure
window using pcolor, and then allow the user to draw lines over it in
order to match some of the linear trends in the data. I was using
the command 'gline' in order to do this. What we want is the slope
of the line, so I was just doing this:
line_handle = gline;
<<the user then draws a line in the figure window>>
X = get(line_handle,'X');
Y = get(line_handle,'Y');
Then I was going to compute the slope of the line from the x and y
data. This works fine when I test it from the comma...

**Re: Slope and Intercept #5**On Tue, Apr 28, 2009 at 4:00 PM, sasbegy <pattukuttani@gmail.com> wrote:
> On Apr 28, 3:41 pm, Shankar <shankar.s...@gmail.com> wrote:
> > If you need just "one slope and intercept" from entire data set, then
> > Murphy got it right;
> >
> > You can do that in PROC REG if you have SAS/STAT ;
> >
> > If you do not have SAS/STAT, perhaps you can use standard solution,
> > based on Least-Squares estimates and implement it in a data step; Is
> > that what you want to do?
> >
> > But first I think you need to cla...

**Re: Slope and Intercept #3**I have no idea... :) I don't do regressions.
I also don't recall the format for writing the slope over many variables,
but it's something like
sum ((Y-mean(y))/(x-mean(x))) I imagine. In any event, if you don't have
PROC REG, then you need to find out the formula for doing it manually, and
then do it that way...
works out to something similar to:
proc sql;
select sum ((Y-mean(y))/(x-mean(x))) from dataset;
quit;
If you want to use more traditional sas, try using PROC MEANS or PROC FREQ
to get whatever statistics you need for the calculation.
Anyhow, I suggest you reply to...

**finding y-intercepts of a curve.**Hi there, hopefully someone can help as this is driving me insane. I have a data set of points that make up a profile of layers deformed by something pushing down from above.
I've separated each layer out, and normalised it to y=0, such that when plotted, I have 65 points making a line which starts at y=0, rises, then drops below y=0 for a while, then rises above again, before returning to zero.
I need to find the points where this line crosses the y axis (to measure the length of the depression and the surrounding uplifts).
The way I have been doing this is by plotting, fitting a shap...

**Re: Slope and Intercept #4**I imagine you could do that in PROC SQL easily. Do you know the formula
(ie, the math formula) for calculating slope and intercept?
-Joe
On Tue, Apr 28, 2009 at 3:00 PM, sasbegy <pattukuttani@gmail.com> wrote:
> On Apr 28, 3:41 pm, Shankar <shankar.s...@gmail.com> wrote:
> > If you need just "one slope and intercept" from entire data set, then
> > Murphy got it right;
> >
> > You can do that in PROC REG if you have SAS/STAT ;
> >
> > If you do not have SAS/STAT, perhaps you can use standard solution,
> > based on Least-Squ...

**Re: Slope and Intercept #7**If you don't have SAS/STAT, thus can't use proc reg, another way of
getting the slope and intercept with proc corr is:
proc corr data=sashelp.class (rename=(height=x weight=y))
outp=output;
var y x;
run;
data _null_;
set output;
retain mean_x mean_y std_x std_y;
if _TYPE_ eq 'MEAN' then do;
mean_x=x;
mean_y=y;
end;
else if _TYPE_ eq 'STD' then do;
std_x=x;
std_y=y;
end;
else if _TYPE_ eq 'CORR' and
_NAME_ eq 'x' then do;
slope=std_y/std_x*y;
intercept=mean_y-mean_x*slope;
put slope=;
put inter...