Can't find the syntax errors
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Ted Ersek
el 2 de Mayo de 2013
Comentada: Walter Roberson
el 19 de Mayo de 2022
I am using MATLAB, SeduMi and YALMIP to implement the algorithm published here. I know I have SeDuMi and YALMIP installed correctly. Before implementing that complicated algorithm, I wanted to use the same approach on an easier problem. With that in mind I tried the code that below, but I get syntax errors. Please show me how to fix the errors. If you can get it working that's even better. The syntax errors are:
- Keyword for is underlined red with the message: "Invalid use of keyword."
- norm(residulas,Inf)); has the right most ')' underlined red with the message:"Parse error at ')': usage might be invalid MATLAB syntax."
- Keyword end is underlined red with the message: "Parse error at END: usage might be invalid MATLAB syntax."
addpath(genpath('C:\Program Files\MATLAB\R2010b\toolbox\yalmip'))
path(path,'D:\Documents and Settings\My Documents\MATLAB\SeDuMi_1_1')
path(path, 'D:\Documents and Settings\My Documents\MATLAB\SeDuMi_1_1\convr')
xvals = 1:0.1:7;
yvals = -xvals.^2+8*xvals-15.5;
residuals = zeros(length(xvals));
% a, w, phi, c are parameters to be optimized
a = sdpvar(1,1);
w = sdpvar(1,1);
phi = sdpvar(1,1);
c = sdpvar(1,1);
delta_step = sdpvar(4,1);
options = sdpsettings('solver','sedumi','usex0',1,'verbose',1);
assign(a,-10.58);
assign(w,0.47);
assign(phi,1.2);
assign(c,-9.87);
% determine values of a, w, phi, c that give a minimax
% approximation of (yvals, xvals) using y = a*cos( w*x + phi) + c
% BTW: It seems the solution is y = -10.6072*cos(0.4729*x+1.25)-9.9049
constraints = [ -11<=a<=-9, 0.35<=w<=0.7, 0.8<=phi<=1.25, -11<=c<=-6,...
norm(delta_step,2)<=0.04 ];
% 2nd argument of solvesdp is a for loop followed by norm(residuals,inf)
solvesdp(constraints,...
for k=1:length(xvals)
xval=xvals(k);
yval=yvals(k);
% gradient of (a*cos( w*x + phi) + c) WRT (a,b,phi,c)
gradient = [cos(w*xval)+phi,-a*xval*sin(w*xval)+phi,...
-a*sin(w*xval)+phi,1];
step=gradient*(delta_step);
residuals(k)=yval-(a*cos(w*xval+phi)-c)+step;
end
norm(residuals,Inf));
solution = [double(a),double(w),double(phi),double(c)];
5 comentarios
Johan Löfberg
el 19 de Mayo de 2022
and there is no reason to assign initials, as sedumi does not support warmstarts (and even if it did, warmstarting primal-dual solvers with primals only will never help more than absolutely marginally)
Walter Roberson
el 19 de Mayo de 2022
It looks as if optimize() was available at least as early as 2010, but that solvesdp was being worked on up to at least 2014.
Respuesta aceptada
Alan Weiss
el 2 de Mayo de 2013
Editada: Alan Weiss
el 2 de Mayo de 2013
Thank you for the clarification. Take a look at these lines, towards the bottom of your code:
solvesdp(constraints,...
for k=1:length(xvals)
Obviously, there should be something in between these lines, to close the parentheses in the solvesdp function. After that, you can write a for loop and it should work correctly.
What I mean is, you need to write your for loop separately, outside the solvedsp function call. You might need to rework the function definition so that it expects the correct thing. Make a variable that is the result of the for loop or something, and pass that variable to the function.
Alan Weiss
MATLAB mathematical toolbox documentation
3 comentarios
Rahul Meshram
el 17 de Mayo de 2022
clear all; FileName1 = uigetfile("*", "); im101 = imread(FileName1); im102 imresize(im101,[312 312]); K1=im102(:,:,.2); im103 = rgb2gray(im102); im103 = imbinarize(im103); imshow(im103);
FileName2 = uigetfile("** ,"); im201 = imread(FileName2); im202= imresize(im201,[312 312]); K2 =im202(:,:,2); im203 = rgb2gray(im202); im203= imbinarize(im203); imshow(im203);
P1 = detectSURFFeatures(im103); strongest = P1.selectStrongest(200); plot(strongest);
P2 = detectSURFFeatures(im203); [f1,valid_points1] = extractFeatures(im103,P1); [f2,valid_points2] = extractFeatures (im203,P2); indexPairs = matchFeatures(f1,f2);
disp(indexPairs); disp(length(indexPairs));
matchedPoints1 = valid_points 1 (indexPairs(:,1));
matchedPoints2 = valid_points2(indexPairs(:,2));
figure; ax = axes; showMatchedFeatures(im103,im203,matchedPoints1,matchedPoints2, montage','Parent',ax)
title('Counterfeit Currency Detection');
if length(indexPairs) >=80 msgbox('Currency Is Real");
else msgbox('Currency Is Counterfeit'); end
Here is one error occurred, this is syntax error. How can I solve for fake currency detection
Walter Roberson
el 18 de Mayo de 2022
im102 imresize(im101,[312 312]);
missing assignment operator
Más respuestas (1)
Alan Weiss
el 2 de Mayo de 2013
Please show us the errors you get.
Alan Weiss
MATLAB mathematical toolbox documentation
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