<\/p>\n
Greg’s<\/a> pick this week is slQuery<\/a> by Robert Rasche<\/a>. <\/p>\n Robert has created an impressive mechanism for finding and operating on elements of Simulink models from MATLAB scripts and functions. <\/p>\n The part I feel he understates in his description of the entry is the ability to find blocks based on what the blocks are connected to, not just properties of the blocks themselves. <\/p>\n Once you get a handle on the query syntax, it’s pretty trivial to create complex queries of Simulink model blocks.<\/p>\n If you want to access blocks in a Simulink model, the standard APIs do enable you to locate blocks based on the properties of those blocks. <\/p>\n The standard API most users know about is the If you want to search for a block based on property values, the standard API and Find All Atomic Subsystems with Whitespace in the Name:<\/p>\n The standard API uses the addition of functional arguements to build a query, while The slQuery function offers a way to search for blocks based on their connections to other elements in the Simulink model. This pretty much blows my mind! <\/p>\n In my 20 years of using Simulink, I could have definitely used features like this on several occasions.<\/p>\n This is something that the standard API functions Find Inports directly connected to a Gain block<\/strong><\/p>\n Note that this searches currently open Simulink model by default. <\/p>\n Find Feedback Loops<\/strong><\/p>\n There are more sophisticated connection searches available, including the ability to look for feedback loops.<\/p>\n This syntax looks for a block that is connected to itself.<\/p>\n Firstly, I thought this was a really creative way to attack the problems Robert was facing. He leverages the extensibility of the MATLAB Language to great effect. <\/p>\n In addition, this File Exchange entry is documented<\/a>, and provides a number of test cases<\/a>; two elements that make it easier to understand how to use the Let us know here<\/a>. <\/p>\n","protected":false},"excerpt":{"rendered":" \nGreg’s pick this week is slQuery by Robert Rasche.Find Blocks with Specific Properties<\/h3>\n
asbhl20_VehicleSystemsModel;\r\nblocks = slQuery('SubSystem[Name~=\\w+\\s+\\w+, TreatAsAtomicUnit=on]'<\/span>);\r\n% Replace whitespace in block names with underscore \"_\"<\/span>\r\nnames = regexprep(strtrim(blocks.Name), '\\s+'<\/span>, '_'<\/span>)';\r\nnames(1:7)\r\n<\/pre>\nans = 7×1 cell array<\/em>\r\n {'Air_Data_Computer' }\r\n {'Log_LL1_Actuator_Position_Sensors'}\r\n {'Log_LL2_Actuator_Position_Sensors'}\r\n {'Log_LU1_Actuator_Position_Sensors'}\r\n {'Log_LU2_Actuator_Position_Sensors'}\r\n {'Log_Hydraulic_System_1_Sensors' }\r\n {'Log_Hydraulic_System_2_Sensors' }\r\n\r\n<\/pre>\nblocks = Simulink.findBlocksOfType(bdroot, 'SubSystem'<\/span>, ...<\/span>\r\n 'Name'<\/span>, '\\w+\\s+\\w+'<\/span>, ...<\/span>\r\n 'TreatAsAtomicUnit'<\/span>, 'on'<\/span>, ...<\/span>\r\n Simulink.FindOptions('RegExp'<\/span>, true));\r\n% Replace whitespace in block names with underscore \"_\"<\/span>\r\nnames = regexprep(strtrim(get(blocks, 'Name'<\/span>)), '\\s+'<\/span>, '_'<\/span>);\r\nnames(1:7)\r\n<\/pre>\nans = 7×1 cell array<\/em>\r\n {'Air_Data_Computer' }\r\n {'Log_LL1_Actuator_Position_Sensors'}\r\n {'Log_LL2_Actuator_Position_Sensors'}\r\n {'Log_LU1_Actuator_Position_Sensors'}\r\n {'Log_LU2_Actuator_Position_Sensors'}\r\n {'Log_Hydraulic_System_1_Sensors' }\r\n {'Log_Hydraulic_System_2_Sensors' }\r\n\r\n<\/pre>\nFind Blocks with Specific Connections<\/h3>\n
asbhl20;\r\nr = slQuery('Inport -> Gain'<\/span>);\r\ncell2table([r(1).Parent.Name; r(1).Name; r(2).Name], ...<\/span>\r\n 'RowNames'<\/span>, {'Parent'<\/span>, 'Inport'<\/span>, 'Gain'<\/span>})\r\n<\/pre>\nans=3×4 table<\/em>\r\n Var1 Var2 Var3 Var4 \r\n __________________________ ______ ______ _________________\r\n\r\n Parent 'Low Altitude↵Intensity' 'Hqgw' 'Hrgw' 'cascvt' \r\n Inport 'Windspeed ↵at 20ft (6m)' 'V' 'V' 'In1' \r\n Gain 'sigma_wg ' 'pi\/4' 'pi\/3' 'Unit Conversion'\r\n\r\n<\/pre>\n
vdp;\r\nr = slQuery('#vdp \/ Integrator >> $1'<\/span>) ;\r\nr.Name\r\n<\/pre>\nans = 2×2 cell array<\/em>\r\n {'vdp'} {'vdp'}\r\n {'x1' } {'x2' }\r\n\r\n<\/pre>\nWhy Did I Choose This Entry?<\/h3>\n
What Are Your Impressions of This Capability?<\/h3>\n
\nRobert has created an impressive mechanism for finding and operating on elements of Simulink models from MATLAB scripts and functions.
\nThe… read more >><\/a><\/p>\n","protected":false},"author":36,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/posts\/10640"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/users\/36"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/comments?post=10640"}],"version-history":[{"count":9,"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/posts\/10640\/revisions"}],"predecessor-version":[{"id":10888,"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/posts\/10640\/revisions\/10888"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/media?parent=10640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/categories?post=10640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/pick\/wp-json\/wp\/v2\/tags?post=10640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}